Yes, blue light from your phone can harm your skin. A dermatologist explains
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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.
Remind me, what actually is blue light?
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 100-1,000 times 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 on our eyes and sleep.
Now, we’re learning more about the impact of blue light on our skin.
How does blue light affect the skin?
The evidence for blue light’s impact on skin is still emerging. But there are some interesting findings.
1. Blue light can increase pigmentation
Studies suggest 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 suggests blue light might damage collagen, a protein essential for skin structure, potentially accelerating the formation of wrinkles.
A laboratory study suggests 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 100-fold. 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 suppressing 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 quality of your sleep.
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 worsen 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.
Can skincare protect me?
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 melasma 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.
What can I do to minimise blue light then?
Here are some simple steps you can take to minimise your exposure to blue light, especially at night when it can disrupt your sleep:
- 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
- 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
- hold your phone or device away from your skin to minimise exposure to blue light
- use sunscreen. Mineral and physical sunscreens containing titanium dioxide and iron oxides offer broad protection, including from blue light.
In a nutshell
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.
Michael Freeman, Associate Professor of Dermatology, Bond University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Antidepressants: Personalization Is Key!
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Antidepressants: Personalization Is Key!
Yesterday, we asked you for your opinions on antidepressants, and got the above-depicted, below-described, set of responses:
- Just over half of respondents said “They clearly help people, but should not be undertaken lightly”
- Just over a fifth of respondents said “They may help some people, but the side effects are alarming”
- Just under a sixth of respondents said “They’re a great way to correct an imbalance of neurochemicals”
- Four respondents said “They are no better than placebo, and are more likely to harm”
- Two respondents said “They merely mask the problem, and thus don’t really help”
So what does the science say?
❝They are no better than placebo, and are more likely to harm? True or False?❞
True or False depending on who you are and what you’re taking. Different antidepressants can work on many different systems with different mechanisms of action. This means if and only if you’re not taking the “right” antidepressant for you, then yes, you will get only placebo benefits:
- Placebo Effect in the Treatment of Depression and Anxiety ← randomly assigned antidepressants are, shockingly, luck of the draw in usefulness
- Antidepressants versus placebo in major depression: an overview ← “wow this science is messy”
- Comparative efficacy and acceptability of 21 antidepressant drugs: a systematic review and network meta-analysis ← “oh look, it makes a difference which antidepressant we give to people”
Rather than dismissing antidepressants as worthless, therefore, it is a good idea to find out (by examination or trial and error) what kind of antidepressant you need, if you indeed do need such.
Otherwise it is like getting a flu shot and being surprised when you still catch a cold!
❝They merely mask the problem, and thus don’t really help: True or False?❞
False, categorically.
The problem in depressed people is the depressed mood. This may be influenced by other factors, and antidepressants indeed won’t help directly with those, but they can enable the person to better tackle them (more on this later).
❝They may help some people, but the side-effects are alarming: True or False?❞
True or False depending on more factors than we can cover here.
Side-effects vary from drug to drug and person to person, of course. As does tolerability and acceptability, since to some extent these things are subjective.
One person’s dealbreaker may be another person’s shrugworthy minor inconvenience at most.
❝They’re a great way to correct an imbalance of neurochemicals: True or False?❞
True! Contingently.
That is to say: they’re a great way to correct an imbalance of neurochemicals if and only if your problem is (at least partly) an imbalance of neurochemicals. If it’s not, then your brain can have all the neurotransmitters it needs, and you will still be depressed, because (for example) the other factors* influencing your depression have not changed.
*common examples include low self-esteem, poor physical health, socioeconomic adversity, and ostensibly bleak prospects for the future.
For those for whom the problem is/was partly a neurochemical imbalance and partly other factors, the greatest help the antidepressants give is getting the brain into sufficient working order to be able to tackle those other factors.
Want to know more about the different kinds?
Here’s a helpful side-by-side comparison of common antidepressants, what type they are, and other considerations:
Mind | Comparing Antidepressants
Want a drug-free approach?
You might like our previous main feature:
The Mental Health First-Aid That You’ll Hopefully Never Need
Take care!
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Quercetin Quinoa Probiotic Salad
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This quercetin-rich salad is a bit like a tabbouleh in feel, with half of the ingredients switched out to maximize phenolic and gut-healthy benefits.
You will need
- ½ cup quinoa
- ½ cup kale, finely chopped
- ½ cup flat leaf parsley, finely chopped
- ½ cup green olives, thinly sliced
- ½ cup sun-dried tomatoes, roughly chopped
- 1 pomegranate, peel and pith removed
- 1 preserved lemon, finely chopped
- 1 oz feta cheese or plant-based equivalent, crumbled
- 1 tsp black pepper, coarse ground
- 1 tbsp capers
- 1 tbsp chia seeds
- 1 tbsp extra virgin olive oil
Note: you shouldn’t need salt or similar here, because of the diverse gut-healthy fermented products bringing their own salt with them
Method
(we suggest you read everything at least once before doing anything)
1) Rinse the quinoa, add the tbsp of chia seeds, cook as normal for quinoa (i.e. add hot water, bring to boil, simmer for 15 minutes or so until pearly and tender), carefully (don’t lose the chia seeds; use a sieve) drain and rinse with cold water to cool. Shake off excess water and/or pat dry on kitchen paper if necessary.
2) Mix everything gently but thoroughly.
3) Serve:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Tasty Tabbouleh with Tahini ← in case you want an actual tabbouleh
- Making Friends With Your Gut (You Can Thank Us Later)
- Fight Inflammation & Protect Your Brain, With Quercetin
Take care!
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Celery vs Cucumber – Which is Healthier?
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Our Verdict
When comparing celery to cucumber, we picked the celery.
Why?
They are both great, of course! But celery came out on top:
Their macros are very comparable; they’re both 95% water with just enough other things to hold them together, and those other things are in approximately the same proportions in both celery and cucumber.
In the category of vitamins, however, celery has a lot more of vitamins A, B2, B3, B6, B9, E, and K, as well as slightly more vitamin C. Cucumber, meanwhile, only boasts slightly higher vitamin B1.
An easy win for celery on the vitamin front!
Minerals are closer, but celery still comes out on top with its notably higher calcium and potassium content. Cucumber has more iron and zinc, but the margin is smaller.
As a point in cucumber’s favor, it has been noted for its anti-inflammatory effect in ways that celery hasn’t, but we don’t think this is enough to say it wins over celery sweeping the vitamins category and coming out top for minerals too.
However! They are both great, so enjoy them both, of course.
Want to learn more?
You might like to read:
- Cucumber Extract Beats Glucosamine & Chondroitin… At 1/135th Of The Dose?!
- Some Surprising Truths About Hunger And Satiety ← both celery and cucumber are great for this
Enjoy!
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Chaga Mushrooms’ Immune & Anticancer Potential
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What Do Chaga Mushrooms Do?
Chaga mushrooms, which also go by other delightful names including “sterile conk trunk rot” and “black mass”, are a type of fungus that grow on birch trees in cold climates such as Alaska, Northern Canada, Northern Europe, and Siberia.
They’ve enjoyed a long use as a folk remedy in Northern Europe and Siberia, mostly to boost immunity, mostly in the form of a herbal tea.
Let’s see what the science says…
Does it boost the immune system?
It definitely does if you’re a mouse! We couldn’t find any studies on humans yet. But for example:
- Immunomodulatory Activity of the Water Extract from Medicinal Mushroom Inonotus obliquus
- Inonotus obliquus extracts suppress antigen-specific IgE production through the modulation of Th1/Th2 cytokines in ovalbumin-sensitized mice
(cytokines are special proteins that regulate the immune system, and Chaga tells them to tell the body to produce more white blood cells)
Wait, does that mean it increases inflammation?
Definitely not if you’re a mouse! We couldn’t find any studies on humans yet. But for example:
- Anti-inflammatory effects of orally administered Inonotus obliquus in ulcerative colitis
- Orally administered aqueous extract of Inonotus obliquus ameliorates acute inflammation
Anti-inflammatory things often fight cancer. Does chaga?
Definitely if you’re a mouse! We couldn’t find any studies in human cancer patients yet. But for example:
While in vivo human studies are conspicuous by their absence, there have been in vitro human studies, i.e., studies performed on cancerous human cell samples in petri dishes. They are promising:
- Anticancer activities of extracts and compounds from the mushroom Inonotus obliquus
- Extract of Innotus obliquus induces G1 cell cycle arrest in human colon cancer cells
- Anticancer activity of Inonotus obliquus extract in human cancer cells
I heard it fights diabetes; does it?
You’ll never see this coming, but: definitely if you’re a mouse! We couldn’t find any human studies yet. But for example:
- Anti-diabetic effects of Inonotus obliquus in type 2 diabetic mice
- Anti-diabetic effects of Inonotus obliquus in type 2 diabetic mice and potential mechanism
Is it safe?
Honestly, there simply have been no human safety studies to know for sure, or even to establish an appropriate dosage.
Its only-partly-understood effects on blood sugar levels and the immune system may make it more complicated for people with diabetes and/or autoimmune disorders, and such people should definitely seek medical advice before taking chaga.
Additionally, chaga contains a protein that can prevent blood clotting. That might be great by default if you are at risk of blood clots, but not so great if you are already on blood-thinning medication, or otherwise have a bleeding disorder, or are going to have surgery soon.
As with anything, we’re not doctors, let alone your doctors, so please consult yours before trying chaga.
Where can we get it?
We don’t sell it (or anything else), but for your convenience, here’s an example product on Amazon.
Enjoy!
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Uric Acid’s Extensive Health Impact (And How To Lower It)
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Uric Acid’s Extensive Health Impact (And How To Lower It)
This is Dr. David Perlmutter. He’s a medical doctor, and a Fellow of the American College of Nutrition. He’s a member of the Editorial Board for the Journal of Alzheimer’s Disease, and has been widely published in many other peer-reviewed journals.
What does he want us to know?
He wants us to know about the health risks of uric acid (not something popularly talked about so much!), and how to reduce it.
First: what is it? Uric acid is a substance we make in our own body. However, unlike most substances we make in our body, we have negligible use for it—it’s largely a waste product, usually excreted in urine.
However, if we get too much, it can build up (and crystallize), becoming such things as kidney stones, or causing painful inflammation if it shows up in the joints, as in gout.
More seriously (unpleasant as kidney stones and gout may be), this inflammation can have a knock-on effect triggering (or worsening) other inflammatory conditions, ranging from non-alcoholic fatty liver disease, to arthritis, to dementia, and even heart problems. See for example:
- David Perlmutter | Uric Acid and Cognitive Decline
- American Heart Association | Uric acid linked to later risk for irregular heart rhythm
- World Journal of Gastroenterology | The role of uric acid in non-alcoholic steatohepatitis development
How can we reduce our uric acid levels?
Uric acid is produced when we metabolize purine nucleotides, which are found in many kinds of food. We can therefore reduce our uric acid levels by reducing our purine intake, as well as things that mess up our liver’s ability to detoxify things. Offsetting the values for confounding variables (such as fiber content, or phytochemicals that mitigate the harm), the worst offenders include…
Liver-debilitating things:
- Alcohol (especially beer)
- High-fructose corn syrup (and other fructose-containing things that aren’t actual fruit)
- Other refined sugars
- Wheat / white flour products (this is why beer is worse than wine, for example; it’s a double-vector hit)
Purine-rich things:
- Red meats and game
- Organ meats
- Oily fish, and seafood (great for some things; not great for this)
Some beans and legumes are also high in purines, but much like real fruit has a neutral or positive effect on blood sugar health despite its fructose content, the beans and legumes that are high in purines, also contain phytochemicals that help lower uric acid levels, so have a beneficial effect.
Eggs (consumed in moderation) and tart cherries have a uric-acid lowering effect.
Water is important for all aspects of health, and doubly important for this.
Hydrate well!
Lifestyle matters beyond diet
The main key here is metabolic health, so Dr. Perlmutter advises the uncontroversial lifestyle choices of moderate exercise and good sleep, as well as (more critically) intermittent fasting. We wrote previously on other things that can benefit liver health:
…in this case, that means the liver gets a break to recuperate (something it’s very good at, but does need to get a chance to do), which means that while you’re not giving it something new to do, it can quickly catch up on any backlog, and then tackle any new things fresh, next time you start eating.
Want to know more about this from Dr. Perlmutter?
You might like his article:
An Integrated Plan for Lowering Uric Acid ← more than we had room for here; he also talks about extra things to include in your diet/supplementation regime for beneficial effects!
And/or his book:
…on which much of today’s main feature was based.
Take care!
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Yes, you still need to use sunscreen, despite what you’ve heard on TikTok
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Summer is nearly here. But rather than getting out the sunscreen, some TikTokers are urging followers to chuck it out and go sunscreen-free.
They claim it’s healthier to forgo sunscreen to get the full benefits of sunshine.
Here’s the science really says.
Karolina Grabowska/Pexels How does sunscreen work?
Because of Australia’s extreme UV environment, most people with pale to olive skin or other risk factors for skin cancer need to protect themselves. Applying sunscreen is a key method of protecting areas not easily covered by clothes.
Sunscreen works by absorbing or scattering UV rays before they can enter your skin and damage DNA or supportive structures such as collagen.
When UV particles hit DNA, the excess energy can damage our DNA. This damage can be repaired, but if the cell divides before the mistake is fixed, it causes a mutation that can lead to skin cancers.
The energy from a particle of UV (a photon) causes DNA strands to break apart and reconnect incorrectly. This causes a bump in the DNA strand that makes it difficult to copy accurately and can introduce mutations. NASA/David Herring The most common skin cancers are basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). Melanoma is less common, but is the most likely to spread around the body; this process is called metastasis.
Two in three Australians will have at least one skin cancer in their lifetime, and they make up 80% of all cancers in Australia.
Around 99% of skin cancers in Australia are caused by excessive exposure to UV radiation.
Excessive exposure to UV radiation also affects the appearance of your skin. UVA rays are able to penetrate deep into the skin, where they break down supportive structures such as elastin and collagen.
This causes signs of premature ageing, such as deep wrinkling, brown or white blotches, and broken capillaries.
Sunscreen can help prevent skin cancers
Used consistently, sunscreen reduces your risk of skin cancer and slows skin ageing.
In a Queensland study, participants either used sunscreen daily for almost five years, or continued their usual use.
At the end of five years, the daily-use group had reduced their risk of squamous cell carcinoma by 40% compared to the other group.
Ten years later, the daily use group had reduced their risk of invasive melanoma by 73%
Does sunscreen block the health-promoting properties of sunlight?
The answer is a bit more complicated, and involves personalised risk versus benefit trade-offs.
First, the good news: there are many health benefits of spending time in the sun that don’t rely on exposure to UV radiation and aren’t affected by sunscreen use.
Sunscreen only filters UV rays, not all light. Ron Lach/Pexels Sunscreen only filters UV rays, not visible light or infrared light (which we feel as heat). And importantly, some of the benefits of sunlight are obtained via the eyes.
Visible light improves mood and regulates circadian rhythm (which influences your sleep-wake cycle), and probably reduces myopia (short-sightedness) in children.
Infrared light is being investigated as a treatment for several skin, neurological, psychiatric and autoimmune disorders.
So what is the benefit of exposing skin to UV radiation?
Exposing the skin to the sun produces vitamin D, which is critical for healthy bones and muscles.
Vitamin D deficiency is surprisingly common among Australians, peaking in Victoria at 49% in winter and being lowest in Queensland at 6% in summer.
Luckily, people who are careful about sun protection can avoid vitamin D deficiency by taking a supplement.
Exposing the skin to UV radiation might have benefits independent of vitamin D production, but these are not proven. It might reduce the risk of autoimmune diseases such as multiple sclerosis or cause release of a chemical that could reduce blood pressure. However, there is not enough detail about these benefits to know whether sunscreen would be a problem.
What does this mean for you?
There are some benefits of exposing the skin to UV radiation that might be blunted by sunscreen. Whether it’s worth foregoing those benefits to avoid skin cancer depends on how susceptible you are to skin cancer.
If you have pale skin or other factors that increase you risk of skin cancer, you should aim to apply sunscreen daily on all days when the UV index is forecast to reach 3.
If you have darker skin that rarely or never burns, you can go without daily sunscreen – although you will still need protection during extended times outdoors.
For now, the balance of evidence suggests it’s better for people who are susceptible to skin cancer to continue with sun protection practices, with vitamin D supplementation if needed.
Katie Lee, PhD Candidate, Dermatology Research Centre, The University of Queensland and Rachel Neale, Principal research fellow, QIMR Berghofer Medical Research Institute
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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