Search

From eye exams to blood tests and surgery: how doctors use light to diagnose disease

<a href="https://theconversation.com/profiles/matthew-griffith-1539353">Matthew Griffith</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a> You’re not feeling well. You’ve had a pounding headache all week, dizzy spells and have vomited up your past few meals. You visit your GP to get some answers and sit while they shine a light in your eyes, order a blood test and request some medical imaging. Everything your GP just did relies on light. These are just some of the optical technologies that have had an enormous impact in how we diagnose disease. <h2>1. On-the-spot tests</h2> Point-of-care diagnostics allow doctors to test patients on the spot and get answers in minutes, rather than sending samples to a lab for analysis. The “flashlight” your GP uses to view the inside of your eye (known as an <a href="https://medlineplus.gov/ency/article/003881.htm">ophthalmoscope</a>) is a great example. This allows doctors to detect abnormal blood flow in the eye, deformations of the cornea (the outermost clear layer of the eye), or swollen optical discs (a round section at the back of the eye where the nerve link to the brain begins). Swollen discs are a sign of elevated pressure inside your head (or in the worst case, a brain tumour) that could be <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/headache/increased-intracranial-pressure-icp-headache">causing your headaches</a>. The invention of <a href="https://openmedscience.com/lighting-the-way-in-healthcare-the-transformative-role-of-lasers-in-medicine/">lasers and LEDs</a> has enabled many other miniaturised technologies to be provided at the bedside or clinic rather than in the lab. <a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">Pulse oximetry</a> is a famous example, where a clip attached to your finger reports how well your blood is oxygenated. It does this by <a href="https://www.howequipmentworks.com/pulse_oximeter/">measuring</a> the different responses of oxygenated and de-oxygenated blood to different colours of light. Pulse oximetry is used at hospitals (and <a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">sometimes at home</a>) to monitor your respiratory and heart health. In hospitals, it is also a valuable tool for detecting <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(12)60107-X/fulltext">heart defects in babies</a>. <h2>2. Looking at molecules</h2> Now, back to that blood test. Analysing a small amount of your blood can diagnose <a href="https://theconversation.com/blood-tests-and-diagnosing-illness-what-can-blood-tell-us-about-whats-happening-in-our-body-80327">many different diseases</a>. A machine called an automated “full blood count analyser” tests for general markers of your health. This machine directs focused beams of light through blood samples held in small glass tubes. It counts the number of blood cells, determines their specific type, and reports the level of haemoglobin (the protein in red blood cells that distributes oxygen around your body). In minutes, this machine can provide a <a href="https://www.nuffieldhealth.com/article/inside-the-pathology-lab-what-happens-to-my-blood">snapshot</a> of your overall health. For more specific disease markers, blood serum is separated from the heavier cells by spinning in a rotating instrument called a centrifuge. The serum is then exposed to special chemical stains and enzyme assays that change colour depending on whether specific molecules, which may be the sign of a disease, are present. These colour changes can’t be detected with the naked eye. However, a light beam from an instrument called a <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476943/#R88">spectrometer</a> can detect tiny amounts of these substances in the blood and determine if the biomarkers for diseases are present, and at what levels. <h2>3. Medical imaging</h2> Let’s re-visit those medical images your GP ordered. The development of fibre-optic technology, made famous for transforming high-speed digital communications (such as the NBN), allows light to get inside the body. The result? High-resolution optical imaging. A common example is an <a href="https://www.medicalnewstoday.com/articles/153737#risks-and-side-effects">endoscope</a>, where fibres with a tiny camera on the end are inserted into the body’s natural openings (such as your mouth or anus) to examine your gut or respiratory tracts. Surgeons can insert the same technology through tiny cuts to view the inside of the body on a video screen during <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9553337/">laparoscopic surgery</a> (also known as keyhole surgery) to diagnose and treat disease. <h2>How about the future?</h2> Progress in nanotechnology and a better understanding of the interactions of light with our tissues are leading to new light-based tools to help diagnose disease. These include: <ul> <li> <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201903441">nanomaterials</a> (materials on an extremely small scale, many thousands of times smaller than the width of a human hair). These are being used in next-generation sensors and new diagnostic tests </li> <li> <a href="https://www.nature.com/articles/s41587-019-0045-y">wearable optical biosensors</a> the size of your fingernail can be included in devices such as watches, contact lenses or finger wraps. These devices allow non-invasive measurements of sweat, tears and saliva, in real time </li> <li> AI tools to analyse how blood serum scatters infrared light. This has allowed researchers to build a <a href="https://www.advancedsciencenews.com/powerful-diagnostic-approach-uses-light-to-detect-virtually-all-forms-of-cancer/">comprehensive database</a> of scatter patterns to detect <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/aisy.202300006">any cancer</a> </li> <li> a type of non-invasive imaging called <a href="https://www.ncbi.nlm.nih.gov/books/NBK554044/">optical coherence tomography</a> for more detailed imaging of the eye, heart and skin </li> <li> fibre optic technology to deliver a tiny microscope into the body on the <a href="https://www.uwa.edu.au/projects/microscope-in-a-needle">tip of a needle</a>. </li> </ul> So the next time you’re at the GP and they perform (or order) some tests, chances are that at least one of those tests depend on light to help diagnose disease.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/231379/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/matthew-griffith-1539353">Matthew Griffith</a>, Associate Professor and ARC Future Fellow and Director, UniSA Microscopy and Microanalysis Facilities, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/from-eye-exams-to-blood-tests-and-surgery-how-doctors-use-light-to-diagnose-disease-231379">original article</a>.

Body

How light can shift your mood and mental health

<a href="https://theconversation.com/profiles/jacob-crouse-981668">Jacob Crouse</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/emiliana-tonini-1638957">Emiliana Tonini</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/ian-hickie-961">Ian Hickie</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> It’s spring and you’ve probably noticed a change in when the Sun rises and sets. But have you also noticed a change in your mood? We’ve known for a while that light plays a role in our wellbeing. Many of us tend to feel more positive when <a href="https://pubmed.ncbi.nlm.nih.gov/32925966/">spring returns</a>. But for others, big changes in light, such as at the start of spring, can be tough. And for many, bright light at night can be a problem. Here’s what’s going on. <h2>An ancient rhythm of light and mood</h2> In an <a href="https://theconversation.com/how-light-tells-you-when-to-sleep-focus-and-poo-236780">earlier article</a> in our series, we learned that light shining on the back of the eye sends “<a href="https://pubmed.ncbi.nlm.nih.gov/25451984/">timing signals</a>” to the brain and the master clock of the circadian system. This clock coordinates our daily (circadian) rhythms. “Clock genes” also regulate circadian rhythms. These genes control the timing of when many other genes <a href="https://pubmed.ncbi.nlm.nih.gov/31557726/">turn on and off</a> during the 24-hour, light-dark cycle. But how is this all linked with our mood and mental health? Circadian rhythms can be disrupted. This can happen if there are problems with how the body clock develops or functions, or if someone is routinely exposed to bright light at night. When circadian disruption happens, it increases the risk of certain <a href="https://pubmed.ncbi.nlm.nih.gov/33689801/">mental disorders</a>. These include <a href="https://www.sciencedirect.com/science/article/abs/pii/S0149763422000744">bipolar disorder</a> and <a href="https://bmcmedicine.biomedcentral.com/articles/10.1186/1741-7015-11-79">atypical depression</a> (a type of depression when someone is extra sleepy and has problems with their energy and metabolism). <h2>Light on the brain</h2> Light may also affect circuits <a href="https://pubmed.ncbi.nlm.nih.gov/35687680/">in the brain</a> that control mood, as <a href="https://pubmed.ncbi.nlm.nih.gov/23151476/">animal studies show</a>. There’s evidence this happens in humans. A brain-imaging study showed exposure to bright light in the daytime while inside the scanner <a href="https://www.cell.com/fulltext/S0960-9822(06)01758-1">changed the activity</a> of a brain region involved in mood and alertness. Another brain-imaging study <a href="https://pubmed.ncbi.nlm.nih.gov/22111663/">found</a> a link between daily exposure to sunlight and how the neurotransmitter (or chemical messenger) serotonin binds to receptors in the brain. We see alterations in serotonin binding in several <a href="https://pubmed.ncbi.nlm.nih.gov/33651238/">mental disorders</a>, including depression. <h2>What happens when the seasons change?</h2> Light can also affect mood and mental health as the seasons change. During autumn and winter, symptoms such as low mood and fatigue can develop. But often, once spring and summer come round, these symptoms go away. This is called “seasonality” or, when severe, “<a href="https://www.aafp.org/pubs/afp/issues/2020/1201/p668.html">seasonal affective disorder</a>”. What is less well known is that for other people, the change to spring and summer (when there is more light) can also come with a change in mood and mental health. Some people experience increases in energy and the drive to be active. This is positive for some but can be seriously destabilising for others. This too is an example of seasonality. Most people <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239033">aren’t very seasonal</a>. But for those who are, seasonality has a <a href="https://pubmed.ncbi.nlm.nih.gov/8540777/">genetic component</a>. Relatives of people with seasonal affective disorder are more likely to also experience seasonality. Seasonality is also more common in conditions such as <a href="https://pubmed.ncbi.nlm.nih.gov/25063960/">bipolar disorder</a>. For many people with such conditions, the shift into shorter day-lengths during winter can trigger a depressive episode. Counterintuitively, the longer day-lengths in spring and summer can also destabilise people with bipolar disorder into an “<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10947388/">activated</a>” state where energy and activity are in overdrive, and symptoms are harder to manage. So, seasonality can be serious. Alexis Hutcheon, who experiences seasonality and helped write this article, told us: <blockquote> […] the season change is like preparing for battle – I never know what’s coming, and I rarely come out unscathed. I’ve experienced both hypomanic and depressive episodes triggered by the season change, but regardless of whether I’m on the ‘up’ or the ‘down’, the one constant is that I can’t sleep. To manage, I try to stick to a strict routine, tweak medication, maximise my exposure to light, and always stay tuned in to those subtle shifts in mood. It’s a time of heightened awareness and trying to stay one step ahead. </blockquote> <h2>So what’s going on in the brain?</h2> One explanation for what’s going on in the brain when mental health fluctuates with the change in seasons relates to the neurotransmitters serotonin and dopamine. Serotonin helps regulate mood and is the target of <a href="https://journals.sagepub.com/doi/full/10.1177/0706743716659417">many</a> <a href="https://pubmed.ncbi.nlm.nih.gov/38185236/">antidepressants</a>. There is some evidence of seasonal changes in serotonin levels, potentially being lower <a href="https://academic.oup.com/brain/article/139/5/1605/2468755?login=false">in</a> <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(02)11737-5/abstract?cc=y%3D">winter</a>. Dopamine is a neurotransmitter involved in reward, motivation and movement, and is also a target of some <a href="https://journals.sagepub.com/doi/full/10.1177/0706743716659417">antidepressants</a>. Levels of dopamine may also change with the <a href="https://www.nature.com/articles/s41398-023-02365-x">seasons</a>. But the neuroscience of seasonality is a developing area and more research <a href="https://www.nature.com/articles/s41398-023-02365-x">is needed</a> to know what’s going on in the brain. <h2>How about bright light at night?</h2> We know exposure to bright light at night (for instance, if someone is up all night) can disturb someone’s circadian rhythms. This type of circadian rhythm disturbance is associated with higher rates of symptoms <a href="https://www.nature.com/articles/s44220-023-00135-8">including</a> self-harm, depressive and anxiety symptoms, and lower wellbeing. It is also associated with higher rates of <a href="https://pubmed.ncbi.nlm.nih.gov/32639562/">mental disorders</a>, such as major depression, bipolar disorder, psychotic disorders and post-traumatic stress disorder (or PTSD). Why is this? Bright light at night confuses and destabilises the body clock. It disrupts the rhythmic regulation of mood, cognition, appetite, metabolism and <a href="https://pubmed.ncbi.nlm.nih.gov/38214638/">many</a> <a href="https://pubmed.ncbi.nlm.nih.gov/34419186/">other</a> <a href="https://pubmed.ncbi.nlm.nih.gov/33689801/">mental</a> <a href="https://pubmed.ncbi.nlm.nih.gov/36661342/">processes</a>. But people differ hugely in their <a href="https://www.pnas.org/doi/10.1073/pnas.1901824116">sensitivity to light</a>. While still a hypothesis, people who are most sensitive to light may be the most vulnerable to body clock disturbances caused by bright light at night, which then leads to a higher risk of mental health problems. <h2>Where to from here?</h2> Learning about light will help people better manage their mental health conditions. By encouraging people to better align their lives to the light-dark cycle (to stabilise their body clock) we may also help prevent conditions such as <a href="https://pubmed.ncbi.nlm.nih.gov/34419186/">depression</a> and <a href="https://www.sciencedirect.com/science/article/pii/S0149763422000744">bipolar disorder</a> emerging in the first place. Healthy light behaviours – avoiding light at night and seeking light during the day – are good for everyone. But they might be especially helpful for people <a href="https://www.sciencedirect.com/science/article/pii/S0149763422000744">at risk</a> of mental health problems. These include people with a family history of mental health problems or people who are <a href="https://pubmed.ncbi.nlm.nih.gov/38185236/">night owls</a> (late sleepers and late risers), who are more at risk of body clock disturbances. <hr /> Alexis Hutcheon has lived experience of a mental health condition and helped write this article. If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/231282/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/jacob-crouse-981668">Jacob Crouse</a>, Research Fellow in Youth Mental Health, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/emiliana-tonini-1638957">Emiliana Tonini</a>, Postdoctoral Research Fellow, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/ian-hickie-961">Ian Hickie</a>, Co-Director, Health and Policy, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-light-can-shift-your-mood-and-mental-health-231282">original article</a>.

Mind

How light tells you when to sleep, focus and poo

<a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Exposure to light is crucial for our physical and mental health, as this and future articles in the series will show. But the timing of that light exposure is also crucial. This tells our body to wake up in the morning, when to poo and the time of day to best focus or be alert. When we’re exposed to light also controls our body temperature, blood pressure and even chemical reactions in our body. But how does our body know when it’s time to do all this? And what’s light got to do with it? <h2>What is the body clock, actually?</h2> One of the key roles of light is to re-set our body clock, also known as the circadian clock. This works like an internal oscillator, similar to an actual clock, ticking away as you read this article. But rather than ticking you can hear, the body clock is a network of genes and proteins that regulate each other. This network sends signals to organs via hormones and the nervous system. These complex loops of interactions and communications have a rhythm of about 24 hours. In fact, we don’t have one clock, we have trillions of body clocks throughout the body. The central clock is in the hypothalamus region of the brain, and each cell in every organ has its own. These clocks work in concert to help us adapt to the daily cycle of light and dark, aligning our body’s functions with the time of day. However, our body clock is not precise and works to a rhythm of about 24 hours (24 hours 30 minutes on average). So every morning, the central clock needs to be reset, signalling the start of a new day. This is why light is so important. The central clock is directly connected to <a href="https://journals.sagepub.com/doi/abs/10.1177/07487304231225706">light-sensing cells</a> in our retinas (the back of the eye). This daily re-setting of the body clock with morning light is essential for ensuring our body works well, in sync with our environment. In parallel, <a href="https://theconversation.com/does-it-matter-what-time-of-day-i-eat-and-can-intermittent-fasting-improve-my-health-heres-what-the-science-says-203762">when we eat food</a> also plays a role in re-setting the body clock, but this time the clock in organs other than the brain, such as the liver, kidneys or the gut. So it’s easy to see how our daily routines are closely linked with our body clocks. And in turn, our body clocks shape how our body works at set times of the day. <h2>What time of day?</h2> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=450&fit=crop&dpr=1 600w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=450&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=450&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=566&fit=crop&dpr=1 754w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=566&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=566&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Matt Garrow/The Conversation. <a class="source" href="https://delos.com/blog/why-natural-light-is-important-for-mental-and-physical-health/">Adapted from Delos</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a></figcaption></figure> <h2>Let’s take a closer look at sleep</h2> The naturally occurring brain hormone <a href="https://pubmed.ncbi.nlm.nih.gov/30311830/">melatonin</a> is linked to our central clock and makes us feel sleepy at certain times of day. When it’s light, our body stops making melatonin (its production is inhibited) and we are alert. Closer to bedtime, the hormone is made, then secreted, making us feel drowsy. Our sleep is also <a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00944/full">partly controlled</a> by <a href="https://www.annualreviews.org/content/journals/10.1146/annurev-genom-121222-120306">our genes</a>, which are part of our central clock. These genes influence our <a href="https://theconversation.com/does-it-matter-what-time-i-go-to-bed-198146">chronotype</a> – whether we are a “lark” (early riser), “night owl” (late sleeper) or a “dove” (somewhere in between). But exposure to light at night when we are supposed to be sleeping can have harmful effects. Even dim light from light pollution can impair our <a href="https://www.pnas.org/doi/10.1073/pnas.2113290119">heart rate and how we metabolise sugar</a> (glucose), may lead to <a href="https://doi.org/10.1038/s44220-023-00135-8">psychiatric disorders</a> such as depression, anxiety and bipolar disorder, and increases the overall risk of <a href="https://www.pnas.org/doi/10.1073/pnas.2405924121">premature death</a>. The main reason for these harmful effects is that light “at the wrong time” disturbs the body clock, and these effects are more pronounced for “night owls”. This “misaligned” exposure to light is also connected to the detrimental health effects we often see in people who <a href="https://theconversation.com/why-does-night-shift-increase-the-risk-of-cancer-diabetes-and-heart-disease-heres-what-we-know-so-far-190652">work night shifts</a>, such as an increased risk of cancer, diabetes and heart disease. <h2>How about the gut?</h2> Digestion also follows a circadian rhythm. Muscles in the colon that help move waste <a href="https://doi.org/10.1111/j.1572-0241.2004.40453.x">are more active</a> during the day and slow down at night. The most significant increase in colon movement starts at 6.30am. This is one of the reasons why most people feel the urge to poo <a href="https://theconversation.com/why-do-i-poo-in-the-morning-a-gut-expert-explains-229624">in the early morning</a> rather than at night. The gut’s day-night rhythm is a direct result of the action of the gut’s own clock and the central clock (which synchronises the gut with the rest of the body). It’s also influenced by when we eat. <h2>How about focusing?</h2> Our body clock also helps control our attention and alertness levels by changing how our brain functions at certain times of day. Attention and alertness levels improve in the afternoon and evening but dip during the night and early morning. Those fluctuations <a href="https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2012.00050/full">impact performance</a> and can lead to decreased productivity and an <a href="https://www.nature.com/articles/s41598-019-40914-x">increased risk</a> of errors and accidents during the less-alert hours. So it’s important to perform certain tasks that <a href="https://pubmed.ncbi.nlm.nih.gov/30923475/">require our attention</a> at certain times of day. That includes driving. In fact, disruption of the circadian clock at the start of daylight savings – when our body hasn’t had a chance to adapt to the clocks changing – <a href="https://www.sciencedirect.com/science/article/pii/S0960982219316781?via%3Dihub">increases the risk</a> of a car accident, particularly in the morning. <h2>What else does our body clock control?</h2> Our body clock influences many other aspects of our biology, including: <ul> <li>physical performance by controlling the activity of our <a href="https://doi.org/10.1038/s41574-023-00805-8">muscles</a></li> <li>blood pressure by controlling the <a href="https://theconversation.com/what-time-of-day-should-i-take-my-medicine-125809">system of hormones</a> involved in regulating our blood volume and blood vessels</li> <li>body temperature by controlling our metabolism and our level of physical activity</li> <li>how our body handles drugs and toxins by <a href="https://doi.org/10.1080/17460441.2023.2224554">controlling enzymes</a> involved in how the liver and kidneys eliminate these substances from the body.</li> </ul> <h2>Morning light is important</h2> But what does this all mean for us? Exposure to light, especially in the morning, is crucial for synchronising our circadian clock and bodily functions. As well as setting us up for a good night’s sleep, increased morning light exposure benefits our <a href="https://www.sciencedirect.com/science/article/pii/S0165032721008612?via%3Dihub">mental health</a> and <a href="https://academic.oup.com/jcem/article/101/9/3539/2806883">reduces the risk of obesity</a>. So boosting our exposure to morning light – for example, by going for a walk, or having breakfast outside – can directly benefit our mental and metabolic health. However, there are other aspects about which we have less control, including <a href="https://www.sciencedirect.com/science/article/pii/S0168952524001100">the genes</a> that control our body clock.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/236780/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, Associate Professor, Physiology of Circadian Rhythms, Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, NHMRC Emerging Leadership Fellow Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-light-tells-you-when-to-sleep-focus-and-poo-236780">original article</a>.

Body

Yes, blue light from your phone can harm your skin. A dermatologist explains

<a href="https://theconversation.com/profiles/michael-freeman-223922">Michael Freeman</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> Social media is full of claims that everyday habits can harm your skin. It’s also full of recommendations or advertisements for products that can protect you. Now social media has blue light from our devices in its sights. So can scrolling on our phones really damage your skin? And will applying creams or lotions help? Here’s what the evidence says and what we should really be focusing on. <h2>Remind me, what actually is blue light?</h2> Blue light is part of the visible light spectrum. Sunlight is the strongest source. But our electronic devices – such as our phones, laptops and TVs – also emit it, albeit at levels <a href="https://melasmaclinic.com.au/wp-content/uploads/2024/01/Melasma-LEDS.pdf">100-1,000 times</a> lower. Seeing as we spend so much time using these devices, there has been some concern about the impact of blue light on our health, including <a href="https://theconversation.com/do-blue-light-glasses-really-work-can-they-reduce-eye-strain-or-help-me-sleep-213145">on our eyes and sleep</a>. Now, we’re learning more about the impact of blue light on our skin. <h2>How does blue light affect the skin?</h2> The evidence for blue light’s impact on skin is still emerging. But there are some interesting findings. 1. Blue light can increase pigmentation <a href="https://academic.oup.com/ced/article-abstract/46/5/934/6598472?redirectedFrom=fulltext&login=false">Studies</a> <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/srt.13401">suggest</a> exposure to blue light can stimulate production of melanin, the natural skin pigment that gives skin its colour. So too much blue light can potentially worsen hyperpigmentation – overproduction of melanin leading to dark spots on the skin – especially in people with darker skin. 2. Blue light can give you wrinkles Some research <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6280109/">suggests</a> blue light might damage collagen, a protein essential for skin structure, potentially accelerating the formation of wrinkles. A laboratory <a href="https://pubmed.ncbi.nlm.nih.gov/29399830/">study suggests</a> this can happen if you hold your device one centimetre from your skin for as little as an hour. However, for most people, if you hold your device more than 10cm away from your skin, that would reduce your exposure <a href="https://en.wikipedia.org/wiki/Inverse-square_law">100-fold</a>. So this is much less likely to be significant. 3. Blue light can disrupt your sleep, affecting your skin If the skin around your eyes looks dull or puffy, it’s easy to blame this directly on blue light. But as we know blue light affects sleep, what you’re probably seeing are some of the visible signs of sleep deprivation. We know blue light is particularly good at <a href="https://journals.physiology.org/doi/full/10.1152/japplphysiol.01413.2009?rss=1">suppressing</a> production of melatonin. This natural hormone normally signals to our bodies when it’s time for sleep and helps regulate our sleep-wake cycle. By suppressing melatonin, blue light exposure before bed disrupts this natural process, making it harder to fall asleep and potentially reducing the <a href="https://www.tandfonline.com/doi/abs/10.1080/07420528.2023.2173606">quality of your sleep</a>. The stimulating nature of screen content further disrupts sleep. Social media feeds, news articles, video games, or even work emails can keep our brains active and alert, hindering the transition into a sleep state. Long-term sleep problems can also <a href="https://academic.oup.com/ced/article-abstract/40/1/17/6621145?login=false">worsen</a> existing skin conditions, such as acne, eczema and rosacea. Sleep deprivation can elevate cortisol levels, a stress hormone that breaks down collagen, the protein responsible for skin’s firmness. Lack of sleep can also weaken the skin’s natural barrier, making it more susceptible to environmental damage and dryness. <h2>Can skincare protect me?</h2> The beauty industry has capitalised on concerns about blue light and offers a range of protective products such as mists, serums and lip glosses. From a practical perspective, probably only those with the more troublesome hyperpigmentation known as <a href="https://dermnetnz.org/topics/melasma">melasma</a> need to be concerned about blue light from devices. This condition requires the skin to be well protected from all visible light at all times. The only products that are totally effective are those that block all light, namely mineral-based suncreens or some cosmetics. If you can’t see the skin through them they are going to be effective. But there is a lack of rigorous testing for non-opaque products outside laboratories. This makes it difficult to assess if they work and if it’s worth adding them to your skincare routine. <h2>What can I do to minimise blue light then?</h2> Here are some simple steps you can take to minimise your exposure to blue light, especially at night when it can disrupt your sleep: <ul> <li> use the “night mode” setting on your device or use a blue-light filter app to reduce your exposure to blue light in the evening </li> <li> minimise screen time before bed and create a relaxing bedtime routine to avoid the types of sleep disturbances that can affect the health of your skin </li> <li> hold your phone or device away from your skin to minimise exposure to blue light </li> <li> use sunscreen. Mineral and physical sunscreens containing titanium dioxide and iron oxides offer broad protection, including from blue light. </li> </ul> <h2>In a nutshell</h2> Blue light exposure has been linked with some skin concerns, particularly pigmentation for people with darker skin. However, research is ongoing. While skincare to protect against blue light shows promise, more testing is needed to determine if it works. For now, prioritise good sun protection with a broad-spectrum sunscreen, which not only protects against UV, but also light.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/233335/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/michael-freeman-223922">Michael Freeman</a>, Associate Professor of Dermatology, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/yes-blue-light-from-your-phone-can-harm-your-skin-a-dermatologist-explains-233335">original article</a>.

Body

People in the world’s ‘blue zones’ live longer – their diet could hold the key to why

<a href="https://theconversation.com/profiles/justin-roberts-1176632">Justin Roberts</a>, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a>; <a href="https://theconversation.com/profiles/joseph-lillis-1505087">Joseph Lillis</a>, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a>, and <a href="https://theconversation.com/profiles/mark-cortnage-438941">Mark Cortnage</a>, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a> Ageing is an inevitable part of life, which may explain our <a href="https://time.com/4672969/why-do-people-want-to-live-so-long/">strong fascination</a> with the <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2726954">quest for longevity</a>. The allure of <a href="https://pubmed.ncbi.nlm.nih.gov/26566891/">eternal youth</a> drives a <a href="https://www.alliedmarketresearch.com/longevity-and-anti-senescence-therapy-market-A14010">multi-billion pound industry</a> ranging from anti-ageing products, supplements and <a href="https://www.everydayhealth.com/diet-nutrition/longevity-diet">diets</a> for those hoping to extend their lifespan. f you look back to the turn of the 20th century, average life expectancy in the UK was around 46 years. Today, it’s closer to <a href="https://population.un.org/wpp/">82 years</a>. We are in fact <a href="https://pubmed.ncbi.nlm.nih.gov/27706136/">living longer than ever before</a>, possibly due to medical advancements and improved <a href="https://www.health.org.uk/publications/reports/mortality-and-life-expectancy-trends-in-the-uk">living and working conditions</a>. But living longer has also come at a price. We’re now seeing higher rates of <a href="https://www.who.int/data/gho/data/themes/mortality-and-global-health-estimates/ghe-leading-causes-of-death">chronic and degenerative diseases</a> – with heart disease consistently topping the list. So while we’re fascinated by what may help us live longer, maybe we should be more interested in being healthier for longer. Improving our “<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4632858/">healthy life expectancy</a>” remains a global challenge. Interestingly, certain locations around the world have been discovered where there are a high proportion of centenarians who display remarkable physical and mental health. The <a href="https://pubmed.ncbi.nlm.nih.gov/15489066/">AKEA study of Sardinia, Italy</a>, as example, identified a “blue zone” (named because it was marked with blue pen), where there was a higher number of locals living in the central-eastern mountainous areas who had reached their 100th birthday compared with the wider Sardinian community. This longevity hotspot has since been expanded, and now includes several other areas around the world which also have greater numbers of longer-living, healthy people. Alongside Sardinia, these blue zones are now <a href="https://www.netflix.com/gb/title/81214929">popularly recognised</a> as: Ikaria, Greece; Okinawa, Japan; Nicoya, Costa Rica; and Loma Linda, California. Other than their long lifespans, people living in these zones also appear to share certain other commonalities, which centre around being <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3874460">part of a community</a>, having a <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4224996/">life purpose</a>, eating <a href="https://pubmed.ncbi.nlm.nih.gov/33514872/">nutritious, healthy foods</a>, keeping <a href="https://www.nature.com/articles/s41398-021-01735-7">stress levels</a> low and undertaking purposeful daily <a href="https://pubmed.ncbi.nlm.nih.gov/30202288/">exercise or physical tasks</a>. Their longevity could also relate to their <a href="https://pubmed.ncbi.nlm.nih.gov/9010380/">environment</a>, being mostly rural (or less polluted), or because of <a href="https://pubmed.ncbi.nlm.nih.gov/22253498/">specific longevity genes</a>. However, studies indicate genetics may only account for <a href="https://pubmed.ncbi.nlm.nih.gov/8786073">around 20-25% of longevity</a> – meaning a person’s lifespan is a complex interaction between lifestyle and genetic factors, which contribute to a long and healthy life. <h2>Is the secret in our diet?</h2> When it comes to diet, each blue zone has its own approach – so one specific food or nutrient does not explain the remarkable longevity observed. But interestingly, a diet rich in <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3662288">plant foods</a> (such as locally-grown vegetables, fruits and legumes) does appear to be reasonably consistent across these zones. For instance, the Seventh-day Adventists of Loma Linda are <a href="https://pubmed.ncbi.nlm.nih.gov/10641813/">predominately vegetarian</a>. For centenarians in Okinawa, <a href="https://pubmed.ncbi.nlm.nih.gov/20234038/">high intakes of flavonoids</a> (a chemical compound typically found in plants) from purple sweet potatoes, soy and vegetables, have been linked with <a href="https://pubmed.ncbi.nlm.nih.gov/11710359/">better cardiovascular health</a> – including lower cholesterol levels and lower incidences of stroke and heart disease. In Nicoya, consumption of locally produced rice and beans has been associated with <a href="https://pubmed.ncbi.nlm.nih.gov/34444746/">longer telomere length</a>. Telomeres are the structural part at the end of our chromosomes which protect our genetic material. Our telomeres get shorter each time a cell divides – so get progressively shorter as we age. Certain <a href="https://pubmed.ncbi.nlm.nih.gov/21102320/">lifestyle factors</a> (such as smoking and poor diet) can also shorten telomere length. It’s thought that telomere length acts as a <a href="https://pubmed.ncbi.nlm.nih.gov/31728493/">biomarker of ageing</a> – so having longer telomeres could, in part, be linked with longevity. But a plant-based diet isn’t the only secret. In Sardinia, for example, meat and fish is consumed in moderation in addition to locally grown vegetables and <a href="https://journalofethnicfoods.biomedcentral.com/articles/10.1186/s42779-022-00152-5">traditional foods</a> such as acorn breads, pane carasau (a sourdough flatbread), honey and soft cheeses. Also observed in several blue zone areas is the inclusion of <a href="https://www.jacc.org/doi/10.1016/j.jacc.2021.10.041">olive oil</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/33669360/">wine</a> (in moderation – around 1-2 glasses a day), as well as <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3830687/">tea</a>. All of these contain powerful antioxidants which may help <a href="https://ncbi.nlm.nih.gov/pmc/articles/PMC10049696/">protect our cells</a> from damage <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6273542/">as we age</a>. Perhaps then, it’s a combination of the protective effects of various nutrients in the diets of these centenarians, which explains their exceptional longevity. Another striking observation from these longevity hot spots is that meals are typically <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7232892">freshly prepared at home</a>. Traditional blue zone diets also don’t appear to contain <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6538973/">ultra-processed foods</a>, fast foods or sugary drinks which may <a href="https://pubmed.ncbi.nlm.nih.gov/32330232/">accelerate ageing</a>. So maybe it’s just as important to consider what these longer-living populations are not doing, as much as what they are doing. There also appears to be a pattern of eating until 80% full (in other words partial <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036399/">caloric reduction</a>. This could be important in also supporting how our cells deal with damage as we age, which could mean a longer life. Many of the factors making up these blue zone diets – primarily plant-based and natural whole foods – are associated with <a href="https://pubmed.ncbi.nlm.nih.gov/35706591/">lower risk of chronic diseases</a> such as <a href="https://pubmed.ncbi.nlm.nih.gov/28728684/">heart disease</a> and <a href="https://pubmed.ncbi.nlm.nih.gov/37589638/">cancer</a>. Not only could such diets contribute to a <a href="https://pubmed.ncbi.nlm.nih.gov/37836577/">longer, healthier life</a>, but could support a more <a href="https://pubmed.ncbi.nlm.nih.gov/33397404/">diverse gut microbiome</a>, which is also associated with healthy ageing. Perhaps then we can learn something from these remarkable centenarians. While diet is only one part of the bigger picture when it comes to longevity, it’s an area we can do something about. In fact, it might just be at the heart of improving not only the quality of our health, but the quality of how we age.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/221463/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/justin-roberts-1176632">Justin Roberts</a>, Professor of Nutritional Physiology, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a>; <a href="https://theconversation.com/profiles/joseph-lillis-1505087">Joseph Lillis</a>, PhD Candidate in Nutritional Physiology, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a>, and <a href="https://theconversation.com/profiles/mark-cortnage-438941">Mark Cortnage</a>, Senior Lecturer in Public Health and Nutrition, <a href="https://theconversation.com/institutions/anglia-ruskin-university-1887">Anglia Ruskin University</a> Image credits: Getty Images This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/people-in-the-worlds-blue-zones-live-longer-their-diet-could-hold-the-key-to-why-221463">original article</a>.

Food & Wine

Pilot captures once in a lifetime photo of the Northern Lights

A pilot has captured the breathtaking moment he flew beside the Northern Lights while manning a cargo plane. Christiaan van Heijst, a pilot and photographer, shared the incredible image to Instagram, which shows the "turquoise aerial fire" appear in the form of the aurora borealis. Beneath the sea of twirling green lights, the city lights of Reykjavik, the capital of Iceland, illuminated the horizon in a contrasting orange glow far away. The extraordinary photo has racked up thousands of likes in just a few days, as Captain van Heijst shared the entertaining story of his flight and the moment he captured the picture in the caption. “Artificial lights on the horizon: a beacon of civilisation and connectedness to the world after many hours of isolation: no communication in my headset except for the bare minimums in regard to procedures, nor any personal interaction from my Icelandic captain, who’s been mute ever since the landing gear went up on the other side of the planet,” he explained in the post. <blockquote class="instagram-media" style="background: #FFF; border: 0; border-radius: 3px; box-shadow: 0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width: 540px; min-width: 326px; padding: 0; width: calc(100% - 2px);" data-instgrm-permalink="https://www.instagram.com/p/C41LrzMsgN6/?utm_source=ig_embed&utm_campaign=loading" data-instgrm-version="14"> <div style="padding: 16px;"> <div style="display: flex; flex-direction: row; align-items: center;"> <div style="background-color: #f4f4f4; border-radius: 50%; flex-grow: 0; height: 40px; margin-right: 14px; width: 40px;"> </div> <div style="display: flex; flex-direction: column; flex-grow: 1; justify-content: center;"> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 100px;"> </div> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; width: 60px;"> </div> </div> </div> <div style="padding: 19% 0;"> </div> <div style="display: block; height: 50px; margin: 0 auto 12px; width: 50px;"> </div> <div style="padding-top: 8px;"> <div style="color: #3897f0; font-family: Arial,sans-serif; font-size: 14px; font-style: normal; font-weight: 550; line-height: 18px;">View this post on Instagram</div> </div> <div style="padding: 12.5% 0;"> </div> <div style="display: flex; flex-direction: row; margin-bottom: 14px; align-items: center;"> <div> <div style="background-color: #f4f4f4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(0px) translateY(7px);"> </div> <div style="background-color: #f4f4f4; height: 12.5px; transform: rotate(-45deg) translateX(3px) translateY(1px); width: 12.5px; flex-grow: 0; margin-right: 14px; margin-left: 2px;"> </div> <div style="background-color: #f4f4f4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(9px) translateY(-18px);"> </div> </div> <div style="margin-left: 8px;"> <div style="background-color: #f4f4f4; border-radius: 50%; flex-grow: 0; height: 20px; width: 20px;"> </div> <div style="width: 0; height: 0; border-top: 2px solid transparent; border-left: 6px solid #f4f4f4; border-bottom: 2px solid transparent; transform: translateX(16px) translateY(-4px) rotate(30deg);"> </div> </div> <div style="margin-left: auto;"> <div style="width: 0px; border-top: 8px solid #F4F4F4; border-right: 8px solid transparent; transform: translateY(16px);"> </div> <div style="background-color: #f4f4f4; flex-grow: 0; height: 12px; width: 16px; transform: translateY(-4px);"> </div> <div style="width: 0; height: 0; border-top: 8px solid #F4F4F4; border-left: 8px solid transparent; transform: translateY(-4px) translateX(8px);"> </div> </div> </div> <div style="display: flex; flex-direction: column; flex-grow: 1; justify-content: center; margin-bottom: 24px;"> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 224px;"> </div> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; width: 144px;"> </div> </div> <p style="color: #c9c8cd; font-family: Arial,sans-serif; font-size: 14px; line-height: 17px; margin-bottom: 0; margin-top: 8px; overflow: hidden; padding: 8px 0 7px; text-align: center; text-overflow: ellipsis; white-space: nowrap;"><a style="color: #c9c8cd; font-family: Arial,sans-serif; font-size: 14px; font-style: normal; font-weight: normal; line-height: 17px; text-decoration: none;" href="https://www.instagram.com/p/C41LrzMsgN6/?utm_source=ig_embed&utm_campaign=loading" target="_blank" rel="noopener">A post shared by Christiaan van Heijst (@jpcvanheijst)</a> </div> </blockquote> “A character known for his absolute approach to colleagues and deliberate lack of conversational depth during flight." “Hours later, the lights of Reykjavik are abundantly visible and without need, heed or warning, he opens up the intercom and takes his time to start his declaration for a single-person audience: me. Staring out of his window, eyes set on the distant orange glow from his left-hand window, he solemnly proclaims a few seconds later: ‘… the centre of the universe …’, allowing some moments of quiet contemplation and thought on my side, before switching his intercom off again, as if to underline this statement and retreating back in his cone of silence." Mr van Heijst said after the pair touched down four hours later in a cargo-airport in central-Europe, neither shared a single word “besides his solemn proclamation of Iceland’s true worth”. The incredible post has unsurprisingly been met with comments from stunned followers in awe of the natural beauty. “Wow! Incredible shot! Silence is golden indeed,” one person wrote. Mr van Heijst is one of the world’s leading aviation photographers, and has been lucky enough to witness the Northern Lights several times from above, capturing the moment each time to share online. Image credits: Instagram

International Travel

Do blue-light glasses really work? Can they reduce eye strain or help me sleep?

<a href="https://theconversation.com/profiles/laura-downie-1469379">Laura Downie</a>, <a href="https://theconversation.com/institutions/the-university-of-melbourne-722">The University of Melbourne</a> Blue-light glasses are said to <a href="https://www.baxterblue.com.au/collections/blue-light-glasses">reduce eye strain</a> when using <a href="https://www.blockbluelight.com.au/collections/computer-glasses">computers</a>, improve your <a href="https://www.ocushield.com/products/anti-blue-light-glasses">sleep</a> and protect your eye health. You can buy them yourself or your optometrist can prescribe them. But <a href="https://mivision.com.au/2019/03/debate-continues-over-blue-blocking-lenses/">do they work</a>? Or could they do you harm? We <a href="https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD013244.pub2/full">reviewed</a> the evidence. Here’s what we found. <h2>What are they?</h2> Blue-light glasses, blue light-filtering lenses or blue-blocking lenses are different terms used to describe lenses that reduce the amount of short-wavelength visible (blue) light reaching the eyes. Most of these lenses prescribed by an optometrist decrease blue light transmission by <a href="https://onlinelibrary.wiley.com/doi/10.1111/opo.12615">10-25%</a>. Standard (clear) lenses do not filter blue light. A wide variety of lens products are available. A filter can be added to prescription or non-prescription lenses. They are widely marketed and are becoming <a href="https://onlinelibrary.wiley.com/doi/10.1111/opo.12615">increasingly popular</a>. There’s often an added cost, which depends on the specific product. So, is the extra expense worth it? <h2>Blue light is all around us</h2> Outdoors, sunlight is the main source of blue light. Indoors, light sources – such as light-emitting diodes (LEDs) and the screens of digital devices – emit varying degrees of blue light. The amount of blue light emitted from artificial light sources is much lower than from the Sun. Nevertheless, artificial light sources are all around us, at home and at work, and we can spend a lot of our time inside. <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=450&fit=crop&dpr=1 600w, https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=450&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=450&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=566&fit=crop&dpr=1 754w, https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=566&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/549210/original/file-20230920-16-tsb23b.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=566&fit=crop&dpr=3 2262w" alt="Blue light-filtering lenses block some blue light from screens from reaching the eye" /></a><figcaption>Screens emit blue light. The lenses are designed to reduce the amount of blue light that reaches the eye. <a class="source" href="https://www.shutterstock.com/image-vector/blue-light-blocking-ray-filter-lens-2286229107">Shutterstock</a></figcaption></figure> Our research team at the University of Melbourne, along with collaborators from Monash University and City, University London, sought to see if the best available evidence supports using blue light-filtering glasses, or if they could do you any harm. So we conducted a <a href="https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD013244.pub2/full">systematic review</a> to bring together and evaluate all the relevant studies. We included all randomised controlled trials (clinical studies designed to test the effects of interventions) that evaluated blue light-filtering lenses in adults. We identified 17 eligible trials from six countries, involving a total of 619 adults. <h2>Do they reduce eye strain?</h2> We found no benefit of using blue light-filtering lenses, over standard (clear) lenses, to reduce eye strain with computer use. This conclusion was based on consistent findings from three studies that evaluated effects on eye strain over time periods ranging from two hours to five days. <h2>Do they help you sleep?</h2> Possible effects on sleep were uncertain. Six studies evaluated whether wearing blue-light filtering lenses before bedtime could improve sleep quality, and the findings were mixed. These studies involved people with a diverse range of medical conditions, including insomnia and bipolar disorder. Healthy adults were not included in the studies. So we do not yet know whether these lenses affect sleep quality in the general population. <h2>Do they boost your eye health?</h2> We did not find any clinical evidence to support using blue-light filtering lenses to protect the macula (the region of the retina that controls high-detailed, central vision). None of the studies evaluated this. <h2>Could they do harm? How about causing headaches?</h2> We could not draw clear conclusions on whether there might be harms from wearing blue light-filtering lenses, compared with standard (non blue-light filtering) lenses. Some studies described how study participants had headaches, lowered mood and discomfort from wearing the glasses. However, people using glasses with standard lenses reported similar effects. <h2>What about other benefits or harms?</h2> There are some important general considerations when interpreting our findings. First, most of the studies were for a relatively short period of time, which limited our ability to consider longer-term effects on vision, sleep quality and eye health. Second, the review evaluated effects in adults. We don’t yet know if the effects are different for children. Finally, we could not draw conclusions about the possible effects of blue light-filtering lenses on many vision and eye health measures, including colour vision, as the studies did not evaluate these. <h2>In a nutshell</h2> Overall, based on relatively limited published clinical data, our review does not support using blue-light filtering lenses to reduce eye strain with digital device use. It is unclear whether these lenses affect vision quality or sleep, and no conclusions can be drawn about any potential effects on the health of the retina. High-quality research is needed to answer these questions, as well as whether the effectiveness and safety of these lenses varies in people of different ages and health status. If you have eye strain, or other eye or vision concerns, discuss this with your optometrist. They can perform a thorough examination of your eye health and vision, and discuss any relevant treatment options.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/213145/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/laura-downie-1469379">Laura Downie</a>, Associate Professor in Optometry and Vision Sciences, <a href="https://theconversation.com/institutions/the-university-of-melbourne-722">The University of Melbourne</a> Image credits: Getty Images This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/do-blue-light-glasses-really-work-can-they-reduce-eye-strain-or-help-me-sleep-213145">original article</a>.

Body

How one brave mum is shedding light on postnatal depression through the healing power of music

Warning: This article contains sensitive content which some readers may find distressing. It’s no secret that having a baby changes your life in every way. From sleepless nights and feeding routines, to nappy changes and seemingly endless crying, starting a family is, put simply, a life-altering experience. And while the early days of having a newborn can bring love and chaos in equal parts, for some, the days, weeks and months after giving birth can welcome a whole new set of challenges. While most parents are privy to the “baby blues” and a rough day here and there, those struggling with postnatal depression can often be overlooked. Postnatal depression is common, with one in five mums, and one in 10 dads, experiencing postnatal depression symptoms after their baby is born. For Lija (pronounced Le-ah), postnatal depression completely changed her life. Lija, a music teacher from the Central Coast of New South Wales, welcomed her first child, a beautiful daughter named Harper, into the world at the end of 2017. When Lija discovered she was going to become a mum, she was overcome with fear. Lija spoke exclusively with OverSixty about her journey with postnatal depression, and how her feelings of anxiety began as soon as she fell pregnant. “There was this lie in my head that I could not give birth… That I would die. You feel like you can’t make a way through it and you’re predicting all these complications. [Lija’s friends’ traumatic birth experience] confirmed all these feelings and i just thought ‘Maybe you die from this’.” As soon as Lija and her husband began to celebrate the news of their growing family, she quickly began to “spiral” into self-doubt and depressive episodes. “When I found out I was pregnant, it was a spiral. I didn’t think I was good enough, I was crying so much… I didn’t feel like I could tell anyone because I was so gripped in fear.” “It took me about seven months to accept that I was having a kid.” Over the course of her pregnancy, Lija’s mental health continued to plummet with her feelings of fear and self-doubt, which led her down an even darker path. “The worst part was I was suicidal. There were moments where I wanted to end my life because I just felt like my time was up.” These feelings of helplessness led Lija to reach out to a counsellor, who helped manage her mental health symptoms for the rest of her pregnancy and introduced her to hypnobirthing. Her sessions with a hypnobirthing specialist gave Lija the boost she needed to be in tune with her body, and get her through to Harper’s birth with a sense of confidence. “If I’ve grown a baby, I can give birth to a baby. It was all just focus.” When Harper was born, Lija remembers healthcare professionals warning her husband that her mental health could decline, but she was never spoken to directly. “Apparently nurses were talking to my husband after the birth saying ‘She’s going to be prone to postnatal depression, you need to watch her’, but no one told me I was going to be so lonely.” “I was so focused on the birth going well that I hadn’t thought about what happens after, and I didn’t know what postnatal depression was.” When Lija and her husband brought baby Harper home, as they encountered perfectly common issues around sleep and breastfeeding, Lija thought she had failed as a first-time mum. “I felt like I failed as a mum because I couldn't give Harper everything she needed. And that started all these terrible thoughts and I just started to mentally spiral down again. But I didn’t know for about six months that I had postnatal depression.” During the first few months of Harper’s life, Lija began to find simple day-to-day tasks very difficult. “My poor husband… I was a psycho. It began when I said no one was allowed to come over because I was constantly in my pyjamas and I felt ashamed that my house wasn’t clean.” Lija shared that as she began to settle into the reality of being a mum, Harper’s needs always came first. “I was just in such a routine. I needed to have my baby follow a good structure, which meant my mental health took a backseat. So I just kept spiralling and spiralling.” As Lija tried to better herself, she quickly found out that comparing yourself to other new parents is a slippery slope that welcomes thoughts of self-doubt. “I tried to go to a mum’s club and they all seemed so perfect. I feel like they weren’t real. It was like Instagram mums. So to try and look good, I was spending all this money to try and keep up appearances.” As Lija’s mental health continued to suffer, she said it wasn’t until a difficult conversation with her husband that she realised she needed professional help. “I wasn’t being the normal me. There was no joy, there was no laughter, and I felt like I failed as a mother and as a wife. So my husband said ‘I’ve booked you in for a therapy session’, and that was the start of it.” “I wanted to be better for Harper. I wanted to be a good mum for her. So I had to start working on myself.” Now, five years on, Lija is reflecting on her experience with postnatal depression in the best way she knows how: through her music. Lija’s debut single Save Me details her journey of becoming a mum and bettering herself, while painting an honest portrait of the first months of motherhood. <iframe title="YouTube video player" src="https://www.youtube.com/embed/tmHTlybb-rM" width="560" height="315" frameborder="0" allowfullscreen="allowfullscreen"></iframe> After being a musician for most of her life, Lija’s passion took a backseat when she became a mother. “I started to miss my music, because I've done music my whole life. It was so hard to walk past my studio and see the guitar going to waste. I started to miss the other half of me as a musician.” After working on Save Me for several years, Lija believes it is the right time to put her story out there in order to help and inspire other parents struggling with postnatal depression. “It’s okay to be vulnerable. Be real, because you can help others with your honesty.” “It’s also important to remember that babies aren’t going to remember the best outfits they were in, or if they had the best pram. They're going to remember if they were loved or not.” Lija has long been a champion of music and its healing power, which became a saviour in her darkest times through her postnatal depression journey. “I went back to teaching music three months after having Harper. I worked one day a week and these kids and teenagers that were singing to me were actually healing me with their music and their talent.” “Music is something I have always turned to. It has always spoken to me, and I thought if I write a song about my journey, that could heal me too. I thought ‘It’s time to kick fear in the butt and write about life’.” Musical talent is something that runs in the family, with Harper’s singing talents already at “the next level”. “I swear she came out singing! Her ability to hear pitch is insane. In lockdown, she would be singing scales while I was teaching music classes over Zoom. She is just so joyous, and she is like my healing.” Lija’s debut single Save Me is out on now. Don't go it alone. Please reach out for help. Lifeline: 13 11 14 or <a href="http://lifeline.org.au/">lifeline.org.au</a> Beyond Blue: 1300 22 4636 or <a href="http://beyondblue.org.au/">beyondblue.org.au</a> Headspace: 1800 650 890 or <a href="http://headspace.org.au/">headspace.org.au</a> PANDA (Perinatal Anxiety & Depression Australia): 1300 726 306 or <a href="https://panda.org.au/">panda.org.au</a> Image credits: Instagram

Music

How to beat the retirement blues

When people plan their retirement they don’t usually expect Post retiring depression (PRD). This kind of depression usually stems from dashed expectations, financial trouble or feeling lost and lonely. That’s why we’ve got four top tips to avoid PRD and enjoy your free time. 1. Plan it out Know what you want to do, not what you think you should be doing. Don’t hold back in indulging yourself, travelling the world, volunteering abroad – the temporary discomfort of not knowing is better than realising when it’s too late that you never completed your bucket list. 2. Routine A sudden lack of structure can become exhausting or at least unsettling. Schedule activities such as exercise, housework, errands, and social time. Then let the day flow from there. 3. Keep active There is a lot of research to show that the people who cope best with retirement are those who stay active and involved. This might include: <ul> <li>Developing an old hobby or starting a new one. </li> <li>Staying physically active, through walking, swimming, gym or sport. Make sure your exercise routine is appropriate for your physical capacities and limitations. </li> <li>Volunteering with a charity or church group. </li> <li>Working part-time. </li> <li>Studying a course.</li> </ul> 4. Stay in touch Loneliness and isolation can be easily avoided, so don’t fall into the trap of feeling alone. Make the effort to stay in contact with family and friends. Offer to babysit your grandchildren. Check out local community centres for upcoming activities you might enjoy. Even if you're not sure try something new, you might surprise yourself! Images: Getty

Retirement Life

"I fell for it!": Boys in blue crash gender reveal party

One Sydney couple have taken their friends and family by surprise with their high-stakes gender reveal, where the father-to-be was apparently put under arrest by two police officers. Mina Ibrahim revealed their elaborate prank with a video posted to his TikTok account. Mina’s video begins with footage of the moment of his ‘arrest’, before it cuts to the TikToker at a later date, explaining that “that’s me being arrested at my baby’s gender reveal.” He goes on to share the full video, and a promise that the ending will answer any questions his viewers may have. In the clip, the parents-to-be can be seen talking to two uniformed NSW ‘police officers’, guests all around them, with Mina asking for onlookers to get their phones out. He then pushes one of the officers, telling them to leave, and both grab him before attempting to handcuff him, while his pregnant partner attempts to intervene. As family members rush to assist, one of the officers calls for everyone to calm down, then delivers news that takes them all by surprise - and delight - by telling them, “it’s a baby girl.” “So it was the cops who announced to everyone that I was having a baby girl,” present-day Mina informed his audience, before noting that there was a fake balloon inside to throw their guests off the surprise scent. <div class="mol-embed" style="margin: 0px 0px 8px; padding: 0px; min-height: 1px; letter-spacing: -0.16px; text-align: center; font-family: graphik, Arial, sans-serif; font-size: 16px; background-color: #ffffff;"> <blockquote id="v34606683345148116" class="tiktok-embed" style="margin: 18px auto; padding: 0px; min-height: 1px; letter-spacing: -0.01em; position: relative; width: 605px; box-sizing: border-box; line-height: 1.15; overflow: hidden; text-size-adjust: 100%; font-family: proxima-regular, PingFangSC, sans-serif; max-width: 605px; min-width: 325px;" cite="https://www.tiktok.com/@mina.ibs/video/7232964823296773383" data-video-id="7232964823296773383" data-embed-from="oembed"><iframe style="letter-spacing: -0.01em; border-width: initial; border-style: none; width: 605px; height: 735px; display: block; visibility: unset; max-height: 735px;" src="https://www.tiktok.com/embed/v2/7232964823296773383?lang=en-GB&referrer=https%3A%2F%2Fwww.dailymail.co.uk%2Fnews%2Farticle-12082153%2FGender-reveal-party-prank-sees-cops-arrest-father-be.html&embedFrom=oembed" name="__tt_embed__v34606683345148116" sandbox="allow-popups allow-popups-to-escape-sandbox allow-scripts allow-top-navigation allow-same-origin"></iframe></blockquote> </div> The prank attracted thousands of views online, with many flocking to his comments section to share their congratulations with the parents-to-be. Others, while thrilled for them and their happy news, were open about their concern, having fallen for the trick right along with the couple’s loved ones. “I fell for it and I was worried for your wife!!!,” one confessed. “I was freaking out hahahah you got me”. “I was worried too haha … you scared me,” another said. “Omygosh! I was ready to sue them coppas with you!” came one response, “but congratsss! What a way to reveal!” One other simply wanted to know if the entire situation was even allowed, believing that impersonating the police may not be. And another had simply been suspicious from the very start, noting “Broooo the whole time I was like … something ain’t right! He’s not carrying his gun”. Images: TikTok

Family & Pets

Aussie author of "Puberty Blues" dies at 64

Gabrielle Carey, co-author of the iconic novel Puberty Blues, has passed away at 64. The news was reportedly broken by Carey’s old friend and co-writer Kathy Lette, who was the other half of the creative powerhouse that brought Puberty Blues to life. In a post to social media, Lette shared a throwback picture of the pair in their younger years, and wrote, “I’m deeply saddened by the tragic news about my old friend Gabrielle Carey. “I have such happy memories of our teenage years. They were halcyon, heady days full of love, laughter and adventure. “We made some mischief and broke some barriers by writing Puberty Blues – our raw, earthy take on the brutal treatment of young women in the Australian surfing scene which is sadly, still so relevant. “My heartfelt condolences to her family and friends.” <blockquote class="twitter-tweet"> I’m deeply saddened by the tragic news about my old friend Gabrielle Carey. I have such happy memories of our teenage years. They were halcyon, heady days full of love, laughter and adventure. 1/2 🧵 <a href="https://t.co/2wZZiRf1hd">pic.twitter.com/2wZZiRf1hd</a> — Kathy Lette (@KathyLette) <a href="https://twitter.com/KathyLette/status/1654136967636959234?ref_src=twsrc%5Etfw">May 4, 2023</a></blockquote> The groundbreaking book they penned together, which went on to be adapted as both a movie and a hit TV series, was a candid - then-controversial - story of two teenage girls growing up in Sydney’s Sutherland Shire. It pushed boundaries, captivated young audiences while tackling themes many did not expect for said target audience, and is regarded by many as being the first Australian teenage novel to be written by teens. From Puberty Blues, Carey went on to publish memoirs and nonfiction works, with another of her books - her 1984 Just Us, which covered her relationship with rapist and prisoner Terry Haley, who she married while he was imprisoned - also made into a telemovie in 1986. No suspicious circumstances surrounded her death, according to The Australian, though the tragic news comes just months after she wrote about her father’s suicide in The Sydney Morning Herald. At the time, Carey had revealed she was afraid of reaching 64, as that was when he too had passed on. “It was only decades later, when my father died from suicide on the very day he turned 64, that I became terrified of that number,” she wrote. “If I have inherited my father’s disposition for depression, did that mean I would also end up in an early grave? Carey’s early passing is one that has hit her friends and her fans hard, with many joining Lette in sharing their grief and their condolences on social media. “Farewell dear Gabrielle. You were a sister in the cause of mental illness, its impact & our children. I’m enriched for having known you,” one supporter wrote. “Thank you.” “Writer - Reader - Intellectual - Joycean (fanatical) - Elizabeth von Arnim devotee - Avid Gardener - Rose Petal Jam Maker - Football Follower - Kayaker - Yogi - Joker - Irrepressible Spirit - Hobbit - Underground Writer - My Friend,” friend and fellow writer Yumna Kassab wrote. “I will always miss you.” “So sorry for your loss,” one fan said in response to Lette’s tweet. “You have no idea how much as a girl growing up in a coastal town with a surfing scene I understood Puberty Blues. I saw it every day. You & Gabrielle laid it all bare & made girls stand up for themselves. Thank you”. “My deepest condolences Kathy,” another offered. “The two of you wrote something so treasured by Gen X girls. It was our ‘how to say no guide’. Our Teen handbook. But it still let us live our lives & learn as we went. RIP Gabrielle Carey.” Images: Facebook

News

Hill Street Blues star passes away

Hill Street Blues star Barbara Bosson has passed away aged 83. Bosson, who played Fay Furillo in the American police drama, was a popular TV star in the ‘80s, earning five consecutive Emmy nominations for her role. She was also the ex-wife of TV giant Steven Bohcho, who created Hill Street Blues and several other hit shows at the time. The news of Bosson’s death was shared by her son, Jesse Bohcho, who shared an image of he and his mother when he was a child. "More spirit and zest than you could shake a stick at. When she loved you, you felt it without a doubt. If she didn't, you may well have also known that too. Forever in our hearts. I love you Mama. Barbara "Babs" Bosson Bochco 1939-2023," he captioned the image. Dirty Dancing star Jennifer Grey shared her support, commenting a red heart under Bochco’s Instagram. Bosson was also known for her roles in shows including Murder One, Hooperman and films including Cop Rock and Calendar Girl Murders. Hill Street Blues proved Bosson's main claim to fame, with her leaving the show in 1985 during its sixth season after being fired from the project over creative disagreements. Bosson and Steven Bohcho went on to work together on other projects, including the Rockford Files spin-off Richie Brockelman, Private Eye, Hooperman and the musical Cop Rock. The pair divorced in 1997 but continued to co-parent their son Jesse, who was born in 1975. Steven died in 2018 at the age of 73. Further details of Bosson’s death are yet to be revealed. Image credit: Instagram

News

How to make the most of your hard-earned savings

When you have a lump sum of money, it can often be very confusing to know what to do with it, when putting it into a bank offers little in the way of interest or reward. Chances are you might have been neglecting your savings, leaving them languishing in accounts that pay very little, if anything at all. But there is a better option that could see you drastically increasing your savings. A term deposit taker, such as boutique investment company Blue Sky money, can offer you far greater returns on your deposit – an impressive 7 per cent, around twice that which banks offer. Better yet, with all profits staying within and benefiting the community, you can also enjoy the knowledge that you’re helping to make a difference to New Zealanders while growing your nest egg. <a href="https://blueskymoney.co.nz/" target="_blank" rel="noopener"><img src="https://oversixtydev.blob.core.windows.net/media/2022/12/Blue-Sky-7.jpg" alt="" width="1280" height="1062" /></a> Set and forget Most of us are far too busy and time-poor to spend too much time tending to our finances. But that doesn’t mean we don’t want to see them grow! At Blue Sky money, with a minimum deposit of $30,000 and a minimum 12-month fixed term, you don’t need to think about anything. You’ll have your own personal customer service agent, and can just sit back and watch as your interest is calculated and paid into your account monthly – no fees, no charges. Believing that looking after your finances should be a pleasure, not a chore, Blue Sky money prides itself on offering a superior service and being far more user friendly than banks, so not only will your money work harder, but you’ll enjoy the satisfaction of feeling part of a financial family that truly cares about your wellbeing. Blue Sky money can also assist with small to medium loans for land, houses or other assets, are on hand to help with reverse mortgages and are even investing in retirement villages. And in an exciting new addition, from 2023 Blue Sky is launching its own travel club for all those who place their deposits. You’ll receive special deals and tour packages, ensuring your money goes even further, while enjoying everything the world has to offer. <img src="https://oversixtydev.blob.core.windows.net/media/2022/12/money-laptop-happy-GettyImages-1307391886.jpg" alt="" width="1280" height="720" /> Improving New Zealanders’ lives And while getting some much-needed extra cash seems like a pretty good deal all on its own, you’ll also have the piece of mind of knowing that with Blue Sky money – a family run business owned by Blue Sky charity, which is registered in New Zealand – all profits stay within New Zealand. With a philosophy of trying to make the world a better place, Blue Sky invests in research and development to better New Zealanders lives – everything from groundbreaking cancer treatment using ultrasound, to sustainable energy, sea trailers and indestructible home builds. Blue Sky money can also assist with small to medium loans for land, houses or other assets, and are available to help with reverse mortgages. And in an exciting new addition, from 2023 Blue Sky is launching its own travel club, where you can receive special deals and tour packages. So if you’re looking to make your savings work harder for you, while aligning yourself with a humanitarian company that’s working to improve the lives of New Zealanders, be sure to get in touch with the Blue Sky team at <a href="https://blueskymoney.co.nz/" target="_blank" rel="noopener">blueskymoney.co.nz</a> <img src="https://oversixtydev.blob.core.windows.net/media/2022/12/tropical-island-GettyImages-1360554439.jpg" alt="" width="1280" height="720" /> Images: Supplied. This is a sponsored article produced in partnership with <a href="https://blueskymoney.co.nz/" target="_blank" rel="noopener">Blue Sky money</a>.

Money & Banking

Jimmy Barnes’ light-hearted surgery update

Jimmy Barnes is back on his feet after a gruelling surgery. The iconic singer has shared an update with his followers on Instagram, as he grinned and stood in his hospital room with the help of a walker. As Barnes smiled ear to ear while standing straight, he added the song Walk This Way by RUN DMC, showing he is in good spirits as he continues his recovery. This is the second update fans have been given in the last 24 hours about Barnes' health after the Aussie rocker's daughter Elly-May Barnes <a href="https://oversixty.com.au/health/caring/jimmy-barnes-daughter-issues-sweet-health-update" target="_blank" rel="noopener">informed</a> that her dad was "out of surgery and awake". In an adorable Instagram post on her father’s account, Elly-may shared an update with a photo of her dad smiling as well as an X-ray of his hip post-surgery. <blockquote class="instagram-media" style="background: #FFF; border: 0; border-radius: 3px; box-shadow: 0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width: 540px; min-width: 326px; padding: 0; width: calc(100% - 2px);" data-instgrm-permalink="https://www.instagram.com/p/CmGYzIIrYYT/?utm_source=ig_embed&utm_campaign=loading" data-instgrm-version="14"> <div style="padding: 16px;"> <div style="display: flex; flex-direction: row; align-items: center;"> <div style="background-color: #f4f4f4; border-radius: 50%; flex-grow: 0; height: 40px; margin-right: 14px; width: 40px;"> </div> <div style="display: flex; flex-direction: column; flex-grow: 1; justify-content: center;"> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 100px;"> </div> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; width: 60px;"> </div> </div> </div> <div style="padding: 19% 0;"> </div> <div style="display: block; height: 50px; margin: 0 auto 12px; width: 50px;"> </div> <div style="padding-top: 8px;"> <div style="color: #3897f0; font-family: Arial,sans-serif; font-size: 14px; font-style: normal; font-weight: 550; line-height: 18px;">View this post on Instagram</div> </div> <div style="padding: 12.5% 0;"> </div> <div style="display: flex; flex-direction: row; margin-bottom: 14px; align-items: center;"> <div> <div style="background-color: #f4f4f4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(0px) translateY(7px);"> </div> <div style="background-color: #f4f4f4; height: 12.5px; transform: rotate(-45deg) translateX(3px) translateY(1px); width: 12.5px; flex-grow: 0; margin-right: 14px; margin-left: 2px;"> </div> <div style="background-color: #f4f4f4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(9px) translateY(-18px);"> </div> </div> <div style="margin-left: 8px;"> <div style="background-color: #f4f4f4; border-radius: 50%; flex-grow: 0; height: 20px; width: 20px;"> </div> <div style="width: 0; height: 0; border-top: 2px solid transparent; border-left: 6px solid #f4f4f4; border-bottom: 2px solid transparent; transform: translateX(16px) translateY(-4px) rotate(30deg);"> </div> </div> <div style="margin-left: auto;"> <div style="width: 0px; border-top: 8px solid #F4F4F4; border-right: 8px solid transparent; transform: translateY(16px);"> </div> <div style="background-color: #f4f4f4; flex-grow: 0; height: 12px; width: 16px; transform: translateY(-4px);"> </div> <div style="width: 0; height: 0; border-top: 8px solid #F4F4F4; border-left: 8px solid transparent; transform: translateY(-4px) translateX(8px);"> </div> </div> </div> <div style="display: flex; flex-direction: column; flex-grow: 1; justify-content: center; margin-bottom: 24px;"> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 224px;"> </div> <div style="background-color: #f4f4f4; border-radius: 4px; flex-grow: 0; height: 14px; width: 144px;"> </div> </div> <p style="color: #c9c8cd; font-family: Arial,sans-serif; font-size: 14px; line-height: 17px; margin-bottom: 0; margin-top: 8px; overflow: hidden; padding: 8px 0 7px; text-align: center; text-overflow: ellipsis; white-space: nowrap;"><a style="color: #c9c8cd; font-family: Arial,sans-serif; font-size: 14px; font-style: normal; font-weight: normal; line-height: 17px; text-decoration: none;" href="https://www.instagram.com/p/CmGYzIIrYYT/?utm_source=ig_embed&utm_campaign=loading" target="_blank" rel="noopener">A post shared by Jimmy Barnes (@jimmybarnesofficial)</a> </div> </blockquote> “Hey everyone it’s @ellymaybarnes, my dadda is out of surgery and awake,” she wrote. “The doctors are very happy. Thanks for all the well wishes” Barnes, 66, was due to perform multiple shows around Australia in 2023 but was forced to cancel the gigs to have surgery on his back and hip to relieve chronic pain. “I’ve been jumping off PAs and stomping around stages for nearly 50 years, but it’s finally caught up with me,” Barnes said in a statement in November. “I’ve had niggling back and hip issues for years, but things suddenly got a lot worse over the last few weeks and I’m now in constant and severe pain.” “As everybody knows, it’s against my religion to blow out gigs but the doctors tell me I need an operation as soon as possible and it will really limit my movement for a few months. “As much as it kills me to inconvenience everyone, I have to get this fixed so I can jump around onstage for another 50 years.” Image credits: Instagram

Caring

Caught in the act: supermassive black hole 8.5 billion light years away enjoys violent stellar snack

A supermassive black hole at the centre of a galaxy some 8.5 billion years way has ripped apart a nearby star, producing some of the most luminous jets ever seen. When stars and other objects stray too close to a <a href="https://cosmosmagazine.com/space/how-big-is-a-black-hole-watch-how-it-eats/" target="_blank" rel="noreferrer noopener">supermassive black hole</a> they are destroyed by the black hole’s immense gravity. These occurrences, known as <a href="https://cosmosmagazine.com/space/a-star-is-torn/" target="_blank" rel="noreferrer noopener">tidal-disruption events (TDEs)</a>, result in a <a href="https://cosmosmagazine.com/space/the-sleeping-giant-black-hole-that-awoke-to-destroy-a-star/" target="_blank" rel="noreferrer noopener">circling disk of material</a> that is slowly pulled into the black hole and very occasionally, as in the case of supermassive black hole AT2022cmc, ejecting bright beams of material travelling close to the speed of light. Luminous jets are produced in an estimated 1% of cases and are known as a type of astronomical occurrence known as a transient, because they are short-lived. Bright flashes from the jets were spotted in data from the <a href="https://www.ztf.caltech.edu/" target="_blank" rel="noreferrer noopener">Zwicky Transient Facility (ZTF)</a> in <a href="https://astronomerstelegram.org/?read=15232" target="_blank" rel="noreferrer noopener">February this year</a> using a special new technique which can comb through the equivalent of a million pages of information every night. Due to the rapid results produced by the novel data analysis method, a research team in the US was able to swiftly follow up on the transient event with multiwavelength observations of the system from different observatory facilities. The jets were visible across many wavelengths, from X-rays to radio, and follow-up observations enabled the European Southern Observatory’s <a href="https://www.eso.org/public/australia/teles-instr/paranal-observatory/vlt/" target="_blank" rel="noreferrer noopener">Very Large Telescope</a> to place AT2022cmc at a whopping distance of 8.5 billion light years away, while optical and infrared observation from NASA’s <a href="https://www.nasa.gov/mission_pages/hubble/main/index.html" target="_blank" rel="noreferrer noopener">Hubble telescope</a> were able to precisely pinpoint AT2022cmc’s location. “The last time scientists discovered one of these jets was well over a decade ago,” said Michael Coughlin, an assistant professor of astronomy at the University of Minnesota Twin Cities and co-lead on the paper <a href="https://www.doi.org/10.1038/s41586-022-05465-8" target="_blank" rel="noreferrer noopener">published in Nature</a>. “From the data we have, we can estimate that relativistic jets are launched in only 1% of these destructive events, making AT2022cmc an extremely rare occurrence.” Exactly why this behaviour is so rare remains an enigma, however, the research team believe that AT2022cmc’s rapid spin powers the jets, adding to the current understanding of the physics of these behemoth dead stars at the centres of galaxies. This detection – and the method used to discover it – are valuable as a future models for astronomers as they scour the skies for more events. “Scientists can use AT2022cmc as a model for what to look for and find more disruptive events from distant black holes,” says lead author Igor Andreoni, from the Department of Astronomy at UMD and NASA Goddard Space Flight Centre. This includes using ground-based optical surveys, as opposed to gamma-ray observatories in space – how previous jets were primarily discovered. “Our new search technique helps us to quickly identify rare cosmic events in the ZTF survey data,” says Andreoni. “And since ZTF and upcoming larger surveys such as <a href="https://www.lsst.org/" target="_blank" rel="noreferrer noopener">Vera Rubin’s Large Synoptic Survey Telescope</a> scan the sky so frequently, we can now expect to uncover a wealth of rare, or previously undiscovered cosmic events and study them in detail. More than ever, big data mining is an important tool to advance our knowledge of the universe”. <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=226753&title=Caught+in+the+act%3A+supermassive+black+hole+8.5+billion+light+years+away+enjoys+violent+stellar+snack" width="1" height="1" data-spai-target="src" data-spai-orig="" data-spai-exclude="nocdn" /> <div id="contributors"> <a href="https://cosmosmagazine.com/science/supermassive-black-hole-stellar-snack/" target="_blank" rel="noopener">This article</a> was originally published on Cosmos Magazine and was written by Clare Kenyon. Image: Getty Images </div>

Technology

Obese yet malnourished toddler mummy sheds light on life in 17th century aristocratic Austria

In a creepy discovery published, a collaboration of German scientists have performed a ‘virtual autopsy’ on a mummified toddler’s body, found in a 17th century Austrian crypt. Buried in a wooden coffin that was slightly too small and deformed the skull, the young child’s body appeared to be both obese and malnourished. Researchers say the findings might provide a rare insight into historical Austrian aristocratic society. By using CT scanning, scientists were able to perform a ‘virtual autopsy’ on the mummy which was naturally mummified in the conditions of the crypt. Well-preserved soft tissue showed the child was a boy, overweight for his age, and radiocarbon dating suggests a date of death between 1550 and 1635 CE. By examining the formation and length of the body’s bones, plus evidence of tooth eruption, the researchers were able to estimate that the child was about one year old when he died. The bones also showed that despite being well-fed, the boy was malnourished, with his malformed ribs displaying signs of rachitic rosary. This condition presents in a pattern of prominent bony knobs at points where the rib joins cartilage and results from diseases associated with specific vitamin deficiencies such as rickets (vitamin D) and scurvy (vitamin C). Vitamin D is found in foods like salmon, tuna, mackerel and beef liver and egg yolks, but we typically only get around 10% of our required Vitamin D from our diets – the rest is made by our bodies when exposed to ultraviolet B (UVB) from the sun. “The combination of obesity along with a severe vitamin-deficiency can only be explained by a generally ‘good’ nutritional status along with an almost complete lack of sunlight exposure,” said Dr Andreas Nerlich of the Academic Clinic Munich-Bogenhausen and lead researcher. The child appears to have died from pneumonia, judging by the evidence of inflammation in the lungs. Rickets is known to make children more vulnerable to pneumonia, suggesting that, sadly, not only was the child malnourished, but that this condition may have also led to his untimely demise. “We have to reconsider the living conditions of high aristocratic infants of previous populations,” said Nerlich. Relatively little is known about aristocratic childhood in the late Renaissance period, so these mummified remains give key insights into life in Europe of a period generally known for its fervent creativity and intellectual development. “This is only one case,” said Nerlich, “but as we know that the early infant death rates generally were very high at that time, our observations may have considerable impact in the over-all life reconstruction of infants even in higher social classes.” To understand more about this period, researchers scoured historical records of the crypt and the family to whom the crypt belonged. Curiously, the child was buried in a simple, unmarked, wooden coffin, although he was dressed in an expensive silk hooded coat. The unmarked coffin appeared to have been slightly too small for the body such that the skull became deformed and was the only infant buried amongst the identifiable adult metal coffins in the crypt. Historical records of renovations on the crypt confirmed the radiocarbon dating, indicating the child was likely buried sometime after 1600 CE. The crypt belonged to the Counts of Starhemberg and traditionally was kept exclusively for the burial of heirs to their titles, and their wives, making the body likely to be that of the first-born (and only) son, Reichard Wilhelm, of Count Starhemberg. “We have no data on the fate of other infants of the family,” Nerlich said, regarding the unique burial. “According to our data, the infant was most probably [the count’s] first-born son after erection of the family crypt, so special care may have been applied.” This article originally appeared on <a href="https://cosmosmagazine.com/history/toddler-mummy-17thcentury-austria/" target="_blank" rel="noopener">cosmosmagazine.com</a> and was written by Clare Kenyon. Image: Andreas et al. (2022)

Travel Trouble

Manipulating light can induce psychedelic experiences – and scientists aren’t quite sure why

For millennia, people have used mind-altering techniques to achieve different states of consciousness, envision spiritual figures, connect with nature, or simply for the fun of it. Psychedelic substances, in particular, have a long and controversial <a href="https://theconversation.com/psychedelic-drugs-can-be-almost-as-life-altering-as-near-death-experiences-189325">history</a>. But for just as long, people have been having these experiences without drugs too, using <a href="https://www.mdpi.com/2076-3425/11/1/101">rhythmic techniques such as rocking, chanting or drumming</a>. Perhaps the most powerful technique of this kind is flickering light, called “ganzflicker”. Ganzflicker effects can be achieved by turning a light on and off, or by alternating colours in a rapid, rhythmic pattern (like a strobe). This can create an instant psychedelic experience. Ganzflicker elicits striking visual phenomena. People can see geometric shapes and illusory colours but sometimes also complex objects, such as animals and faces – all without any chemical stimulants. Sometimes ganzflicker can even lead to altered states of consciousness (such as losing a sense of time or space) and emotions (ranging from fear to euphoria). Although its effects are little known today, ganzflicker has influenced and inspired many people through the ages, including the two of us. We are an art historian and brain scientist working together on an interactive showcase of ganzflicker techniques used in science and art. Our collaboration has culminated in the museum exhibition <a href="https://reshannereeder.com/ganzflicker-exhibit">“Ganzflicker: art, science, and psychedelic experience”</a>, which is part of the 2022 <a href="https://www.beinghumanfestival.org/">Being Human festival</a>. Ganzflicker’s effects were first documented in 1819 by the physiologist <a href="https://www.karger.com/Article/FullText/235945">Jan E. Purkinje</a>. Purkinje discovered that illusory patterns could appear if he faced the sun and waved his hand in front of his closed eyelids. Near the end of the 19th century, an English toymaker and amateur scientist, <a href="https://www.nature.com/articles/051200c0">Charles Benham</a>, produced the first commercially available flicker device: a top with a monochrome pattern that, when spun, produced illusory colours that swirled around the disc. Modified versions of Benham’s “artificial spectrum top” were used in experiments well into the 20th century. William Grey Walter, a pioneering neurophysiologist and cybernetician, <a href="https://link.springer.com/chapter/10.1007/978-3-642-70911-1_17">pushed flicker effects further</a> by using electric strobe lights, synchronised with the brain’s rhythms. Fascinated by the mind-altering potential of Walter’s machinery, the artist Brion Gysin, in collaboration with writer William S. Burroughs and mathematician Ian Sommerville, invented the <a href="http://mindcontrol-research.net/wp-content/uploads/2016/12/14_2_dream-machine-plans.pdf">Dreamachine</a> (1962). <h2>The swinging 60s of drug-free psychedelics</h2> A Dreamachine consists of an upright cylinder with patterns cut into it and a lightbulb suspended at its centre. When spun on a turntable at 78rpm, the flickering patterns (viewed through closed eyelids) can cause trance-like hallucinations. Gysin thought of the Dreamachine as a new kind of artwork – “the first art object to be seen with the eyes closed” – and a form of entertainment, which he believed could replace the television. Others saw the Dreamachine’s potential to be a source of spiritual inspiration. Burroughs thought it could be <a href="https://faroutmagazine.co.uk/brion-gysin-the-pioneering-artist-who-invented-the-dreamachine/">used to</a> “storm the citadels of enlightenment”. The poet Alan Ginsberg said: “It sets up optical fields as religious and mandalic as hallucinogenic drugs – it’s like being able to have jewelled biblical designs and landscapes without taking chemicals.” Flicker experiments in art did not stop with the Dreamachine. Others included Tony Conrad’s groundbreaking structuralist film <a href="https://fourthree.boilerroom.tv/film/flicker-tony-conrad">The Flicker</a> (1966), which was the first artwork to include the warning “may induce epileptic seizures or produce mild symptoms of shock treatment in certain persons”. The conceptual artist James Turrell’s <a href="https://jamesturrell.com/work/bindu-shards/">Bindu Shards</a> (2010) was an enclosed globe that bombards the observer with strobe light. And, more recently, Collective Act created its own <a href="https://dreamachine.world/">Dreamachine</a> (2022) , a public planetarium-style artwork inspired by Gysin’s which toured the UK. <h2>The science of ganzflicker</h2> Two hundred years after Jan Purkinje documented the physiological properties of ganzflicker, scientists still do not have a definitive explanation for how it works. A recent theory proposes that visual phenomena may be the result of interactions between external flicker and the brain’s natural rhythmic electrical pulses, with more intense images manifesting <a href="https://theconversation.com/pseudo-hallucinations-why-some-people-see-more-vivid-mental-images-than-others-test-yourself-here-163025">when the frequencies of flicker and the brain are closest</a>. It is also likely that a strong visual flicker influences brain states. Meaningful visions, altered conscious states and heightened emotions may be the result of <a href="https://www.nature.com/articles/s41467-020-18591-6">imaginative suggestion</a>, which is amplified by the trance-inducing properties of <a href="https://www.mdpi.com/2076-3425/11/1/101">rhythmic stimulation</a>. What is perhaps most powerful about ganzflicker is its universality. Engineers, mathematicians, artists, historians and scientists have all been united by this modest, drug-free means of eliciting dramatic changes in consciousness. The new wave of popularity on this topic will undoubtedly lead to illuminating discoveries in the coming years. Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/manipulating-light-can-induce-psychedelic-experiences-and-scientists-arent-quite-sure-why-192885" target="_blank" rel="noopener">The Conversation</a>.

Art

Diwali festivals light up the world

Celebrations of Diwali, or the Festival of Lights, has seen homes across India and elsewhere in the world light up with colour as many gathered to celebrate it for the first time since the COVID-19 pandemic. For Hindus and Jains, Diwali symbolises the victory of light over darkness and commemorates the return of Lord Ram to the Ayodhya kingdom after 14 years of exile. It’s a time of gift-giving and celebrating with friends and family at mandirs (Hindu temples) or at home, with spaces decorated with oil lamps, candles, fireworks and intricate rangoli designs in doorways. While the festivities are due to end on Wednesday, the celebration reached its peak on Monday, the darkest day of the year. On Sunday night, more than 1.5 million lamps were lit and kept burning for 45 minutes at Ram ki Paidi in the city of Ayodhya, beating last year’s World Guinness Record of 900,000 lamps staying lit. Ahead of Sunday’s event, the city was decked out in fairy lights and a laser and fireworks show illuminated the lanes and riverbanks. The festivities weren’t just restricted to Ayodhya either, with celebrations occurring around the world. The Sikh community celebrated a different festival called Bandi Chhor Divas, or the Day of Liberation, which marked the day that the religion’s sixth teacher, Guru Hargobind, led 52 princes out of prison to Amritsar, a city in the north-western Indian state of Punjab. The two-day festival serves as a reminder of the importance of freedom and civil rights, with the second day coinciding with Diwali. Images: Getty Images

International Travel

"So proud": Blue Wiggle's daughter joins the cast

The daughter of Blue Wiggle Anthony Field has shared she has joined the children's entertainment group as a dancer. Lucia Field, 17, made the announcement on her TikTok account, as she shared a throwback picture of her and her famous dad with Dorothy the Dinosaur. She wrote, "I never would've believed you if 16 years ago you told me I'd be here." She then shared a photo of her in a blue skivvy dancing in front of the giant Wiggles logo. The video, which was posted on the offical Wiggles account, was flooded with comments of people cheering on the new dance member. <div class="embed" style="font-size: 16px; box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; outline: none !important;"><iframe class="embedly-embed" style="box-sizing: inherit; margin: 0px; padding: 0px; border-width: 0px; vertical-align: baseline; width: 610px; max-width: 100%; outline: none !important;" title="tiktok embed" src="https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fwww.tiktok.com%2Fembed%2Fv2%2F7132666717473344769&display_name=tiktok&url=https%3A%2F%2Fwww.tiktok.com%2F%40thewiggles%2Fvideo%2F7132666717473344769%3Fis_copy_url%3D1%26is_from_webapp%3Dv1%26lang%3Den&key=59e3ae3acaa649a5a98672932445e203&type=text%2Fhtml&schema=tiktok" width="340" height="700" frameborder="0" scrolling="no" allowfullscreen="allowfullscreen"></iframe></div> Anthony also commented, saying he was "so proud" of his daughter. Lucia graduated from high school in December last year, with her excited father sharing a photo to Instagram of them together at her formal. In addition to Lucia, Anthony is father to daughter Marie, 16, and son Antonio, 14, whom he shares with his wife of 18 years, Michaela Patisteas. Anthony joined The Wiggles in 1979 alongside retired members Murray Cook, Greg Page and Jeff Fatt. The trio were replaced by 'Yellow Wiggle' Emma Watkins, who left the group in October last year, 'Purple Wiggle' Lachlan Gillespie and 'Red Wiggle' Simon Pryce. Image credits: TikTok

Family & Pets

Warming oceans may force New Zealand’s sperm and blue whales to shift to cooler southern waters

The world’s oceans are absorbing more than <a href="https://www.un.org/en/climatechange/science/climate-issues/ocean-impacts" target="_blank" rel="noopener">90% of the excess heat and energy</a> generated by rising greenhouse gas emissions. But, as the oceans keep warming, rising sea temperatures generate unprecedented cascading effects that include the melting of polar ice, rising seas, marine heatwaves and ocean acidification. This in turn has profound impacts on marine biodiversity and the lives and livelihoods of coastal communities, especially in island nations such as New Zealand. In our latest <a href="https://www.sciencedirect.com/science/article/pii/S1470160X22007075?via%3Dihub" target="_blank" rel="noopener">research</a>, we focused on great whales – sperm and blue whales in particular. They are crucial for maintaining healthy marine ecosystems, but have limited options to respond to climate change: either adapt, die, or move to stay within optimal habitats. We used mathematical models to predict how they are likely to respond to warming seas by the end of the century. Our results show a clear southward shift for both species, mostly driven by rising temperatures at the sea surface. <h2>Computing the fate of whales</h2> Data on the local abundance of both whales species are <a href="https://www.int-res.com/abstracts/meps/v690/p201-217/" target="_blank" rel="noopener">deficient</a>, but modelling provides a powerful tool to predict how their range is likely to shift. We used a <a href="http://macroecointern.dk/pdf-reprints/AraujoNew2007.pdf" target="_blank" rel="noopener">combination of mathematical models</a> (known as correlative species distribution models) to predict the future range shifts of these whale species as a response to three future climate change scenarios of differing severity, as outlined by the Intergovernmental Panel on Climate Change (<a href="https://www.ipcc.ch/" target="_blank" rel="noopener">IPCC</a>). We applied these models, using the whales’ present distributions, to build a set of environmental “rules” that dictate where each species can live. Using climate-dependent data such as sea-surface temperature and chlorophyll A (a measure of phytoplankton growth), as well as static data such as water depth and distance to shore, we applied these rules to forecast future habitat suitability. We chose a scenario of “<a href="https://www.nature.com/articles/d41586-020-00177-3" target="_blank" rel="noopener">modest</a>” response to cutting greenhouse gas emissions (the IPCC’s mitigation strategy RCP4.5), which is the most likely given the current policies, and a worst-case scenario (no policy to cut emissions, RCP8.5), assuming the reality will likely be somewhere between the two. Our projections suggest current habitats in the ocean around the North Island may become unsuitable if sea-surface temperatures continue to rise. These range shifts become even stronger with increasing severity of climate change. For sperm whales, which are currently abundant off Kaikōura where they support eco-tourism businesses, the predicted distribution changes are even more evident than for blue whales, depending on the climate change scenario. While our results do not predict an overall reduction in suitable habitat that would lead to local extinctions, the latitudinal range shifts are nevertheless bound to have important ecological consequences for New Zealand’s marine ecosystems and the people who depend on them. <h2>How whales maintain ecosystems</h2> Great whales are marine ecosystem engineers. They modify their habitats (or create new ones), to suit their needs. In fact, these activities create conditions that other species rely on to survive. They engineer their environment on several fronts. By feeding in one place and releasing their faeces in another, whales convey minerals and other nutrients such as nitrogen and iron from the deep water to the surface, as well as across regions. This process, known as a “<a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0013255" target="_blank" rel="noopener">whale pump</a>”, makes these nutrients available for phytoplankton and other organisms to grow. This is very important because phytoplankton contributes about <a href="https://education.nationalgeographic.org/resource/plankton-revealed" target="_blank" rel="noopener">half of all oxygen to the atmosphere</a> and also captures <a href="https://www.imf.org/Publications/fandd/issues/2019/12/natures-solution-to-climate-change-chami" target="_blank" rel="noopener">about 40% of all released carbon dioxide</a>. By helping the growth of phytoplankton, whales indirectly contribute to the <a href="https://theconversation.com/tiny-plankton-drive-processes-in-the-ocean-that-capture-twice-as-much-carbon-as-scientists-thought-136599" target="_blank" rel="noopener">natural ocean carbon sink</a>. On top of this, each great whale accumulates about <a href="https://www.arcticwwf.org/the-circle/stories/protecting-the-earth-by-protecting-whales/" target="_blank" rel="noopener">33 tonnes of carbon dioxide in their body</a>, which they take to the ocean floor when they die and their carcass sinks. <figure></figure> Ultimately, the impact of warming oceans on whale distribution is an additional stress factor on ecosystems already under pressure from wider threats, including acidification, pollution and over-exploitation. <h2>A way forward to help whales</h2> Sperm whales are the largest toothed whales (odontocetes) and deep-diving apex predators. They primarily feed on squid and fish that live near the bottom of the sea. Blue whales are baleen whales (mysticetes) and filter small organisms from the water. They feed at the surface on zooplankton, particularly dense krill schools along coastlines where cold water from the deep ocean rises toward the surface (so-called <a href="https://oceanservice.noaa.gov/facts/upwelling.html" target="_blank" rel="noopener">upwelling areas</a>). These differences in feeding habits lead to divergent responses to ocean warming. Blue whales show a more distinct southerly shift than sperm whales, particularly in the worst-case scenario, likely because they feed at the surface where ocean warming will be more exacerbated than in the deep sea. Both species have important foraging grounds off New Zealand which may be compromised in the future. Sperm whales are currently occurring regularly off Kaikōura, while blue whales forage in the South Taranaki Bight. Despite these ecological differences, our results show that some future suitable areas around the South Island and offshore islands are common to both species. These regions could be considered sanctuaries for both species to retreat to or expand their habitat in a warming world. This should warrant <a href="https://environment.govt.nz/assets/Publications/Files/Environmental-Report-Card-Marine-Areas-with-Legal-protection_0.pdf" target="_blank" rel="noopener">increased protection of these areas</a>. This article originally appeared on <a href="https://theconversation.com/warming-oceans-may-force-new-zealands-sperm-and-blue-whales-to-shift-to-cooler-southern-waters-188522" target="_blank" rel="noopener">The Conversation</a>. Image: Shutterstock

Travel Trouble

Over 60

News

Shop

Catalogues

Travel

Health

Lifestyle

Finance

Entertainment

Property

Information

Keep up to date

Search

From eye exams to blood tests and surgery: how doctors use light to diagnose disease

How light can shift your mood and mental health

How light tells you when to sleep, focus and poo

Yes, blue light from your phone can harm your skin. A dermatologist explains

People in the world’s ‘blue zones’ live longer – their diet could hold the key to why

Pilot captures once in a lifetime photo of the Northern Lights

Do blue-light glasses really work? Can they reduce eye strain or help me sleep?

How one brave mum is shedding light on postnatal depression through the healing power of music

How to beat the retirement blues

"I fell for it!": Boys in blue crash gender reveal party

Aussie author of "Puberty Blues" dies at 64

Hill Street Blues star passes away

How to make the most of your hard-earned savings

Jimmy Barnes’ light-hearted surgery update

Caught in the act: supermassive black hole 8.5 billion light years away enjoys violent stellar snack

Obese yet malnourished toddler mummy sheds light on life in 17th century aristocratic Austria

Manipulating light can induce psychedelic experiences – and scientists aren’t quite sure why

Diwali festivals light up the world

"So proud": Blue Wiggle's daughter joins the cast

Warming oceans may force New Zealand’s sperm and blue whales to shift to cooler southern waters