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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How Does Fat Actually Leave The Body? Where Does It Go?
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Fat loss is often misunderstood, with many believing it simply “vanishes” through exercise, is simply excreted in solid form in the bathroom, or materially disappears when converted for energy. However, the principle of conservation of mass plays out here, in that the mass in fat doesn’t disappear—it changes its arrangement:
In and out
Fat is composed of carbon, hydrogen, and oxygen atoms, with an example common form of fat in the body being C55H104O6. That’s a lot of Cs and Hs, and a few Os.
When fat leaves the body, it has been primarily converted into carbon dioxide (CO2) and water (H2O).
According to a 2014 study by the University of South Wales, 84% of the mass of fat exits the body as CO2 exhaled through breathing, while 16% leaves as water through sweat, urine, and other bodily fluids (all of which contain H2O).
You’ll notice there are a lot more Os going out, proportionally, than we originally had in the C55H104O6. For this reason, the process requires oxygen intake; for every 10 kilograms of fat burned, by simple mathematics the body needs around 29 kilograms of oxygen.
Physical activity plays a crucial role in fat loss. When the body exerts itself, it naturally switches to a higher oxygen metabolism necessary for fat breakdown. This effect is amplified during intermittent fasting, which boosts human growth hormone (HGH), a hormone that aids in fat metabolism.
However, simply hyperventilating won’t work; exercise is essential to activate these processes—otherwise it’s just a case of oxygen in, oxygen out, without involving the body’s chemical energy reserves.
Consequently, one of the best diet-and-exercise combinations for fat loss is intermittent fasting with high-intensity interval training.
And, as for what to eat, this video says raw vegan, but honestly, that’s not scientific consensus. However, a diet rich in unprocessed (or minimally processed) fruits and vegetables definitely is where it’s at, with the plant-heavy Mediterranean diet generally scoring highest—which can be further improved by skipping the mammals to make it pesco-Mediterranean. Current scientific consensus does not give any extra benefits for also omitting moderate consumption of fish and fermented dairy products, so include those if you want, or skip those if you prefer.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
Are You A Calorie-Burning Machine? (Calorie Mythbusting)
Take care!
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How To Recover Quickly From A Stomach Bug
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How To Recover Quickly From A Stomach Bug
Is it norovirus, or did you just eat something questionable? We’re not doctors, let alone your doctors, and certainly will not try to diagnose from afar. And as ever, if unsure and/or symptoms don’t go away or do get worse, seek professional medical advice.
That out of the way, we can give some very good general-purpose tips for this one…
Help your immune system to help you
So far as you can, you want a happy healthy immune system. For the most part, we’d recommend the following things:
Beyond Supplements: The Real Immune-Boosters!
…but you probably don’t want to be exercising with a stomach bug, so perhaps sit that one out. Exercise is the preventative; what you need right now is rest.
Hydrate—but watch out
Hydration is critical for recovery especially if you have diarrhea, but drinking too much water too quickly will just make things worse. Great options for getting good hydration more slowly are:
- Peppermint tea
- (peppermint also has digestion-settling properties)
- Ginger tea
- See also: Ginger Does A Lot More Than You Think
- Broths
- These will also help replenish your sodium and other nutrients, gently. Chicken soup for your stomach, and all that. A great plant-based option is sweetcorn soup.
- By broths, we mean clear(ish) water-based soups. This is definitely not the time for creamier soups.
❝Milk and dairy products should be avoided for 24 to 48 hours as they can make diarrhea worse.
Initial dietary choices when refeeding should begin with soups and broth.❞
Source: American College of Gastroenterology
Other things to avoid
Caffeine stimulates the digestion in a way that can make things worse.
Fat is more difficult to digest, and should also be avoided until feeling better.
To medicate or not to medicate?
Loperamide (also known by the brand name Imodium) is generally safe when used as directed.
Click here to see its uses, dosage, side effects, and contraindications
Antibiotics may be necessary for certain microbial infections, but should not be anyone’s first-choice treatment unless advised otherwise by your doctor/pharmacist.
Note that if your stomach bug is not something that requires antibiotics, then taking antibiotics can actually make it worse as the antibiotics wipe out your gut bacteria that were busy helping fight whatever’s going wrong in there:
- Facing a new challenge: the adverse effects of antibiotics on gut microbiota and host immunity
- Antibiotics as major disruptors of gut microbiota
- Microbiotoxicity: antibiotic usage and its unintended harm to the microbiome
A gentler helper
If you want to give your “good bacteria” a hand while giving pathogens a harder time of it, then a much safer home remedy is a little (seriously, do not over do it; we are talking 1–2 tablespoons, or around 20ml) apple cider vinegar, taken diluted in a glass of water.
❝Several studies indicate apple cider vinegar (ACV)’s usefulness in lowering postprandial glycemic response, specifically by slowing of gastric motility❞
(Slowing gastric motility is usually exactly what you want in the case of a stomach bug, and apple cider vinegar)
See also:
- Antimicrobial activity of apple cider vinegar against Escherichia coli, Staphylococcus aureus and Candida albicans
- Antibacterial apple cider vinegar eradicates methicillin resistant Staphylococcus aureus and resistant Escherichia coli
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- Peppermint tea
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Apples vs Figs – Which is Healthier?
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Our Verdict
When comparing apples to figs, we picked the figs.
Why?
These two fruits are both known for being quite rich in sugar (but also rich in fiber, which offsets it metabolically), and indeed their macros are quite similar. That said, figs have slightly more protein, fiber, and carbs. Both are considered low glycemic index foods. We can consider this category a tie, or perhaps a nominal win for apples, whose glycemic index is the lower of the two. But since figs’ GI is also low, it’s really not a deciding factor.
In terms of vitamins, apples have more of vitamins C and E, while figs have more of vitamins A, B1, B2, B3, B5, B6, B9, and choline, with noteworthy margins of difference. A clear for figs here.
When it comes to minerals, apples are not higher in any minerals, while figs are several times higher in calcium, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, and zinc. An overwhelming win for figs.
Of course, enjoy either or both, but if you want nutritional density, apples simply cannot compete with figs.
Want to learn more?
You might like to read:
Which Sugars Are Healthier, And Which Are Just The Same?
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Supergreen Superfood Salad Slaw
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When it comes to “eating the rainbow”, in principle green should be the easiest color to get in, unless we live in a serious food desert (or serious food poverty). In practice, however, a lot of meals could do with a dash more green. This “supergreen superfood salad slaw” is remarkably versatile, and can be enjoyed as a very worthy accompaniment to almost any main.
You will need
For the bits:
- ½ small green cabbage, finely diced
- 7 oz tenderstem broccoli, finely chopped
- 2 stalks celery, finely chopped (if allergic, simply omit)
- ½ cucumber, diced into small cubes
- 2 oz kale, finely shredded
- 4 green (spring) onions, thinly sliced
For the dressing:
- 1 cup cashews (if allergic, substitute 1 cup roasted chickpeas)
- ½ cup extra virgin olive oil
- 2 oz baby spinach
- 1 oz basil leaves
- 1 oz chives
- ¼ bulb garlic
- 2 tbsp nutritional yeast
- 1 tbsp chia seeds
- Juice of two limes
Method
(we suggest you read everything at least once before doing anything)
1) Combine the ingredients from the “bits” category in a bowl large enough to accommodate them comfortably
2) Blend the ingredients from the “dressing” category in a blender until very smooth (the crux here is you do not want any stringy bits of spinach remaining)
3) Pour the dressing onto the bits, and mix well to combine. Refrigerate, ideally covered, until ready to serve.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
- Spinach vs Kale – Which is Healthier?
- Brain Food? The Eyes Have It!
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Sunflower Corn Burger
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Burgers are rarely a health food, but in this case, everything in the patty is healthy, and it’s packed with protein, fiber, and healthy fats.
You will need
- 1 can chickpeas
- ¾ cup frozen corn
- ½ cup chopped fresh parsley
- ⅓ cup sunflower seeds
- ⅓ cup cornichon pickles
- ⅓ cup wholegrain bread crumbs (gluten-free, if desired/required)
- ¼ bulb garlic (or more if you want a stronger flavor)
- 1 tbsp extra virgin olive oil, plus more for frying
- 1 tbsp nutritional yeast (or 1 tsp yeast extract)
- 2 tsp ground cumin
- 2 tsp red pepper flakes
- 2 tsp black pepper, coarse ground
- 1 tsp Dijon mustard
- To serve: 4 burger buns; these are not usually healthy, so making your own is best, but if you don’t have the means/time, then getting similarly shaped wholegrain bread buns works just fine.
- Optional: your preferred burger toppings, e.g. greenery, red onion, tomato slices, avocado, jalapeños, whatever does it for you
Note: there is no need to add salt; there is enough already in the pickles.
Method
(we suggest you read everything at least once before doing anything)
1) Combine all the ingredients except the buns (and any optional toppings) in a food processor, pulsing a few times for a coarse texture (not a purée).
2) Shape the mixture into 4 burger patties, and let them chill in the fridge for at least 30 minutes.
3) Heat a skillet over a medium-high heat with some olive oil, and fry the burgers on both sides until they develop a nice golden crust; this will probably take about 4 minutes per side.
4) Assemble in the buns with any toppings you want, and serve:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Sunflower Seeds vs Pumpkin Seeds – Which is Healthier? ← pumpkin seeds have more micronutrients; sunflower seeds have more healthy fats; feel free to use either or both in this recipe
- What Omega-3 Fatty Acids Really Do For Us
- Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
- Making Friends With Your Gut (You Can Thank Us Later)
- Our Top 5 Spices: How Much Is Enough For Benefits?
Take care!
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Butter vs Plant Oils: What The Latest Evidence Shows
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We’ve done some relevant head-to-head comparisons before in our “This or That” section:
- Avocado Oil vs Olive Oil – Which is Healthier?
- Olive Oil vs Coconut Oil – Which is Healthier?
- Sesame Oil vs Almond Oil – Which is Healthier?
- Sunflower Oil vs Canola Oil – Which is Healthier?
- Margarine vs Butter – Which is Healthier
- Butter vs Ghee – Which is Healthier?
We also did a deeper-dive into butter vs margarine:
Butter vs Margarine – Mythbusting Edition ← this one clears up a lot of misinformation about both butter and margarine
As well as: Saturated Fats: What’s The Truth? Can Saturated Fats Be Healthy?
So, we’re not coming into this one today unawares, and/but it’s an interesting comparison we haven’t directly written about before: butter vs plant oils in general
The Study
It was a JAMA Internal Medicine cohort study, which followed 221,054 adults (average age 56 at the start of the study, with a standard deviation of 7 years from that age) for up to 33 years.
Why “up to”? Because not everybody survived the study.
Specifically, 50,932 deaths were recorded, including 12,241 from cancer and 11,240 from cardiovascular disease (CVD).
Participants were categorized into quartiles based on butter or plant-based oil intake, and…
- The highest quartile (i.e. the 25% of people who consumed the most) butter intake linked to a 15% higher total mortality.
- The highest quartile (i.e. the 25% of people who consumed the most) plant-based oil intake linked to a 16% lower total mortality.
But, if those are the opposite ends of the spectrum, what about smaller differences?
Every 10g/day increase in consumption of plant-based oils yielded…
- 11% lower cancer mortality.
- 6% lower CVD mortality.
Meanwhile, 10g/day increase in butter consumption yielded…
- 12% higher cancer mortality.
- 17% higher CVD mortality.
These benefits must have a cap (after all, one cannot just drink liters of olive oil per day for for a 3400% decrease in mortality), but that cap was not ascertained, because there was no group drinking liters of plant oils per day, not even for science.
However, in the realm of small changes, substituting even 10g/intake of total butter with an equivalent amount of plant-based oils yielded 17% lower total mortality.
You can read the study in full, here: Butter and Plant-Based Oils Intake and Mortality
“So, what about the surely great difference between seed oils and olive oil?”
Compared the the vast gaping statistical chasm that lay between the results of butter and the results of plant oils, which plant oil one chooses doesn’t make a huge difference, iff one isn’t consuming a large amount—the important thing was skipping butter in favor of a plant oil of some kind.
Note also that, for example, deep-frying a starchy food like potatoes will cause the resultant fries (or such), even if not visibly oily, to now have about 10–15% of their original weight in water, replaced with oil. So, 100g (about 3oz) of fries may have around 10-15g oil. Obviously, this does depend on the cut and other factors, but that’s a ballpark figure.
Here’s a lengthier discussion about seed oils than we have room for today:
If you’re worried about inflammation, stop stressing about seed oils and focus on the basics ← in other words, yes it counts, but there are other things that count a lot more, such that if you’re paying attention to the other things, the fact that you sprayed your wok with a little canola oil before stir-frying those vegetables isn’t going to make a meaningful difference.
An as for olive oil? It’s a famously healthy oil, and certainly a candidate for the top spot along with avocado oil*:
All About Olive Oil ← we talk lipids, polyphenols, virginity, and more!
*…and it’s worth noting that these two oils’ (excellent) lipids profiles are very similar, meaning that the main factor between them is that olive oil usually retains vitamins that avocado oil doesn’t.
Take care!
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