How much does your phone’s blue light really delay your sleep? Relax, it’s just 2.7 minutes
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It’s one of the most pervasive messages about technology and sleep. We’re told bright, blue light from screens prevents us falling asleep easily. We’re told to avoid scrolling on our phones before bedtime or while in bed. We’re sold glasses to help filter out blue light. We put our phones on “night mode” to minimise exposure to blue light.
But what does the science actually tell us about the impact of bright, blue light and sleep? When our group of sleep experts from Sweden, Australia and Israel compared scientific studies that directly tested this, we found the overall impact was close to meaningless. Sleep was disrupted, on average, by less than three minutes.
We showed the message that blue light from screens stops you from falling asleep is essentially a myth, albeit a very convincing one.
Instead, we found a more nuanced picture about technology and sleep.
What we did
We gathered evidence from 73 independent studies with a total of 113,370 participants of all ages examining various factors that connect technology use and sleep.
We did indeed find a link between technology use and sleep, but not necessarily what you’d think.
We found that sometimes technology use can lead to poor sleep and sometimes poor sleep can lead to more technology use. In other words, the relationship between technology and sleep is complex and can go both ways.
How is technology supposed to harm sleep?
Technology is proposed to harm our sleep in a number of ways. But here’s what we found when we looked at the evidence:
- bright screen light – across 11 experimental studies, people who used a bright screen emitting blue light before bedtime fell asleep an average of only 2.7 minutes later. In some studies, people slept better after using a bright screen. When we were invited to write about this evidence further, we showed there is still no meaningful impact of bright screen light on other sleep characteristics including the total amount or quality of sleep
- arousal is a measure of whether people become more alert depending on what they’re doing on their device. Across seven studies, people who engaged in more alerting or “exciting” content (for example, video games) lost an average of only about 3.5 minutes of sleep compared to those who engaged in something less exciting (for example, TV). This tells us the content of technology alone doesn’t affect sleep as much as we think
- we found sleep disruption at night (for example, being awoken by text messages) and sleep displacement (using technology past the time that we could be sleeping) can lead to sleep loss. So while technology use was linked to less sleep in these instances, this was unrelated to being exposed to bright, blue light from screens before bedtime.
Which factors encourage more technology use?
Research we reviewed suggests people tend to use more technology at bedtime for two main reasons:
- to “fill the time” when they’re not yet sleepy. This is common for teenagers, who have a biological shift in their sleep patterns that leads to later sleep times, independent of technology use.
- to calm down negative emotions and thoughts at bedtime, for apparent stress reduction and to provide comfort.
There are also a few things that might make people more vulnerable to using technology late into the night and losing sleep.
We found people who are risk-takers or who lose track of time easily may turn off devices later and sacrifice sleep. Fear of missing out and social pressures can also encourage young people in particular to stay up later on technology.
What helps us use technology sensibly?
Last of all, we looked at protective factors, ones that can help people use technology more sensibly before bed.
The two main things we found that helped were self-control, which helps resist the short-term rewards of clicking and scrolling, and having a parent or loved one to help set bedtimes.
Why do we blame blue light?
The blue light theory involves melatonin, a hormone that regulates sleep. During the day, we are exposed to bright, natural light that contains a high amount of blue light. This bright, blue light activates certain cells at the back of our eyes, which send signals to our brain that it’s time to be alert. But as light decreases at night, our brain starts to produce melatonin, making us feel sleepy.
It’s logical to think that artificial light from devices could interfere with the production of melatonin and so affect our sleep. But studies show it would require light levels of about 1,000-2,000 lux (a measure of the intensity of light) to have a significant impact.
Device screens emit only about 80-100 lux. At the other end of the scale, natural sunlight on a sunny day provides about 100,000 lux.
What’s the take-home message?
We know that bright light does affect sleep and alertness. However our research indicates the light from devices such as smartphones and laptops is nowhere near bright or blue enough to disrupt sleep.
There are many factors that can affect sleep, and bright, blue screen light likely isn’t one of them.
The take-home message is to understand your own sleep needs and how technology affects you. Maybe reading an e-book or scrolling on socials is fine for you, or maybe you’re too often putting the phone down way too late. Listen to your body and when you feel sleepy, turn off your device.
Chelsea Reynolds, Casual Academic/Clinical Educator and Clinical Psychologist, College of Education, Psychology and Social Work, Flinders University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Life Extension Multivitamins vs Centrum Multivitamins – Which is Healthier
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Our Verdict
When comparing Life Extension Multivitamins to Centrum Multivitamins, we picked the Life Extension.
Why?
The clue here was on the label: “two per day”. It’s not so that they can sell extra filler! It’s because they couldn’t fit it all into one.
While the Centrum Multivitamins is a (respectably) run-of-the-mill multivitamin (and multimineral) containing reasonable quantities of most vitamins and minerals that people supplement, the Life Extension product has the same plus more:
- More of the vitamins and minerals; i.e. more of them are hitting 100%+ of the RDA
- More beneficial supplements, including:
- Inositol, Alpha lipoic acid, Bio-Quercetin phytosome, phosphatidylcholine complex, Marigold extract, Apigenin, Lycopene, and more that we won’t list here because it starts to get complicated if we do.
We’ll have to write some main features on some of those that we haven’t written about before, but suffice it to say, they’re all good things.
Main take-away for today: sometimes more is better; it just necessitates then reading the label to check.
Want to get some Life Extension Multivitamins (and/or perhaps just read the label on the back)? Here they are on Amazon
PS: it bears mentioning, since we are sometimes running brands against each other head-to-head in this section: nothing you see here is an advertisement/sponsor unless it’s clearly marked as such. We haven’t, for example, been paid by Life Extension or any agent of theirs, to write the above. It’s just our own research and conclusion.
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Which Plant Milk?
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Plant-based milks—what’s best?
You asked us to look at some popular plant milks and their health properties, and we said we’d do a main feature, so here it is!
We’ll also give a quick nod to environmental considerations at the end too (they might not be quite what you expect!). That said, as a health and productivity newsletter, we’ll be focusing on the health benefits.
While we can give a broad overview, please note that individual brands may vary, especially in two important ways:
- Pro: many (most?) brands of plant milks fortify their products with extra vitamins and minerals, especially vitamin D and calcium.
- Con: some brands also add sugar.
So, by all means use this guide to learn about the different plants’ properties, and/but still do check labels later.
Alternatively, consider making your own!
- Pros: no added sugar + cheaper
- Cons: no added vitamins and minerals + some equipment required
Almond milk
Almond milk is low in carbs and thus good for a carb-controlled diet. It’s also high in vitamin E and a collection of minerals.
Oat milk
Oats are one of the healthiest “staple foods” around, and while drinking oat milk doesn’t convey all the benefits, it does a lot. It also has one of the highest soluble fiber contents of any milk, which is good for reducing LDL (bad) cholesterol levels.
See for example: Consumption of oat milk for 5 weeks lowers serum cholesterol and LDL cholesterol in free-living men with moderate hypercholesterolemia
Coconut milk
Coconut has a higher fat content than most plant milks, but also contains medium-chain triglycerides (MCTs). These raise HDL (good) cholesterol levels.
Read the study: How well do plant based alternatives fare nutritionally compared to cow’s milk?
Hemp milk
Being made from hemp seeds that contain a lot of protein and healthy fats (including omega-3 and omega-6), hemp milk packs a nutritious punch. It’s carb-free. It’s also THC-free, in case you were wondering, which means no, it does not have psychoactive effects.
Pea milk
It’s very high in protein, and contains an array of vitamins and minerals. It’s not very popular yet, so there isn’t as much research about it. This 2021 study found that it had the nutritional profile the closest to cow’s milk (beating soy by a narrow margin) and praised it as a good alternative for those with a soy allergy.
This is Research Review Monday so we try to stick to pure science, but for your interest… here’s an interesting pop-science article (ostensibly in affiliation with the pea milk brand, Ripple) about the nutritional qualities of their pea milk specifically, which uses particularly nutrient-dense yellow peas, plus some extra vitamin and mineral fortifications:
Read: Ripple Milk: 6 Reasons Why You Should Try Pea Milk
Soy milk
Perhaps the most popular plant milk, and certainly usually the cheapest in stores. It’s high in protein, similar to cow’s milk. In fact, nutritionally, it’s one of the closest to cow’s milk without involving cows as a middleman. (Did you know three quarters of all soy in the world is grown to feed to livestock, not humans? Now you do).
And no, gentlemen-readers, it won’t have any feminizing effects. The human body can’t use the plant estrogens in soy for that. It does give some isoflavone benefits though, which are broadly good for everyone’s health. See for example this research review with 439 sources of its own:
Read: Soy and Health Update: Evaluation of the Clinical and Epidemiologic Literature
Quick note on flavor: nut milks have the flavor of the nut they were made from. Coconut milk tastes of coconut. The other milks listed above don’t have much of a flavor—which in many cases may be what you want.
Note on environmental considerations:
A lot of us try to be as socially responsible as reasonably possible in our choices, so this may be an influencing factor. In a nutshell:
- Oats and Soy are generally grown as vast monocrops, and these are bad for the environment
- They are still better for the environment than cow’s milk though, as for example most soy is grown to feed to cows, not humans. So including cows in the process means four times as much monocrop farming, plus adds several other environmental issues that are beyond the scope of this newsletter.
- Almonds are particularly resource-intensive when it comes to water use.
- Still nowhere near as much as cows, though.
- Peas are grown in places that naturally have very high rainfall, so are a good option here. Same generally goes for rice, which didn’t make the cut today. (Nor did hazelnuts, sorry—we can only include so much!)
- Hemp is by far and away the most environmentally friendly, assuming it is grown in a climate naturally conducive to such.
- Making plant milk at home is usually most environmentally friendly, depending on where your ingredients came from.
- Literally any plant milk is much more environmentally friendly than cow’s milk.
See the science for yourself: Reducing food’s environmental impacts through producers and consumers
See also (if you like graphs and charts): Environmental footprints of dairy and plant-based milks
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See what other 10almonds subscribers are asking!
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It’s Q&A Day at 10almonds!
Q: I would be interested in learning more about collagen and especially collagen supplements/powders and of course if needed, what is the best collagen product to take. What is collagen? Why do we need to supplement the collagen in our body? Thank you PS love the information I am receiving in the news letters. Keep it up
We’re glad you’re enjoying them! Your request prompted us to do our recent Research Review Monday main feature on collagen supplementation—we hope it helped, and if you’ve any more specific (or other) question, go ahead and let us know! We love questions and requests
Q: Great article about the health risks of salt to organs other than the heart! Is pink Himalayan sea salt, the pink kind, healthier?
Thank you! And, no, sorry. Any salt that is sodium chloride has the exact same effect because it’s chemically the same substance, even if impurities (however pretty) make it look different.
If you want a lower-sodium salt, we recommend the kind that says “low sodium” or “reduced sodium” or similar. Check the ingredients, it’ll probably be sodium chloride cut with potassium chloride. Potassium chloride is not only not a source of sodium, but also, it’s a source of potassium, which (unlike sodium) most of us could stand to get a little more of.
For your convenience: here’s an example on Amazon!
Bonus: you can get a reduced sodium version of pink Himalayan salt too!
Q: Can you let us know about more studies that have been done on statins? Are they really worth taking?
That is a great question! We imagine it might have been our recent book recommendation that prompted it? It’s quite a broad question though, so we’ll do that as a main feature in the near future!
Q: Is MSG healthier than salt in terms of sodium content or is it the same or worse?
Great question, and for that matter, MSG itself is a great topic for another day. But your actual question, we can readily answer here and now:
- Firstly, by “salt” we’re assuming from context that you mean sodium chloride.
- Both salt and MSG do contain sodium. However…
- MSG contains only about a third of the sodium that salt does, gram-for-gram.
- It’s still wise to be mindful of it, though. Same with sodium in other ingredients!
- Baking soda contains about twice as much sodium, gram for gram, as MSG.
Wondering why this happens?
Salt (sodium chloride, NaCl) is equal parts sodium and chlorine, by atom count, but sodium’s atomic mass is lower than chlorine’s, so 100g of salt contains only 39.34g of sodium.
Baking soda (sodium bicarbonate, NaHCO₃) is one part sodium for one part hydrogen, one part carbon, and three parts oxygen. Taking each of their diverse atomic masses into account, we see that 100g of baking soda contains 27.4g sodium.
MSG (monosodium glutamate, C₅H₈NO₄Na) is only one part sodium for 5 parts carbon, 8 parts hydrogen, 1 part nitrogen, and 4 parts oxygen… And all those other atoms put together weigh a lot (comparatively), so 100g of MSG contains only 12.28g sodium.
Q: Thanks for the info about dairy. As a vegan, I look forward to a future comment about milk alternatives
Thanks for bringing it up! What we research and write about is heavily driven by subscriber feedback, so notes like this really help us know there’s an audience for a given topic!
We’ll do a main feature on it, to do it justice. Watch out for Research Review Monday!
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Your Brain Is Always Listening – by Dr. Daniel Amen
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There are a lot of books on Cognitive Behavioral Therapy (CBT), so what makes this one different?
While many CBT books have a focus (as this one also does) on controlling Automatic Negative Thoughts (ANTs), this one stands out in two ways:
Firstly: Dr. Amen, a medical doctor and psychiatrist, looks not just as the thoughts and feelings side of things… but also the neurological underpinnings. This makes a difference because it gives a much more tangible handle on some of the problems that we might face.
We wouldn’t tell someone with Type 1 Diabetes that they are “just blaming their pancreas” for blood sugar woes. So what’s with the notion of “this person is just blaming their brain”? Why would be harder on ourselves (or others) for having amygdalae that are a little out of whack, or a sluggish prefrontal cortex, or an overactive anterior cingulate gyrus?
So, Dr. Amen’s understanding and insights help us look at how we can give those bits of brain what they need to perk them up or calm them down.
Secondly, rather than picture-perfect easily-solved neat-and-tidy made-up scenarios as illustrations, he uses real (messy, human) case studies.
This means that we get to see how the methods advised work in the case of, for example, a business executive who has a trauma response to public speaking, because at the age of 12 he had to stand in court and argue for why his father should not receive the death penalty.
Bottom line: if these methods can ease situations like that, maybe we can apply them usefully in our own lives, too.
Click here to check out Your Brain Is Always Listening, and take control of yours!
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A Fresh Take On Hypothyroidism
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The Three Rs To Boost Thyroid-Related Energy Levels
This is Dr. Izabella Wentz. She’s a doctor of pharmacology, and after her own diagnosis with Hashimoto’s thyroiditis, she has taken it up as her personal goal to educate others on managing hypothyroidism.
Dr. Wentz is also trained in functional medicine through The Institute for Functional Medicine, Kalish Functional Medicine, and the American Academy of Anti-Aging Medicine. She is a Fellow of the American Society of Consultant Pharmacists, and holds certifications in Medication Therapy Management as well as Advanced Diabetes Care through the American Pharmacists Association. In 2013, she received the Excellence in Innovation Award from the Illinois Pharmacists Association.
Dr. Wentz’s mission
Dr. Wentz was disenchanted by the general medical response to hypothyroidism in three main ways. She tells us:
- Thyroid patients are not diagnosed appropriately.
- For this, she criticises over-reliance on TSH tests that aren’t a reliable marker of thyroid function, especially if you have Hashimoto’s.
- Patients should be better optimized on their medications.
- For this, she criticizes many prescribed drugs that are actually pro-drugs*, that don’t get converted adequately if you have an underactive thyroid.
- Lifestyle interventions are often ignored by mainstream medicine.
- Medicines are great; they truly are. But medicating without adjusting lifestyle can be like painting over the cracks in a crumbling building.
*a “pro-drug” is what it’s called when the drug we take is not the actual drug the body needs, but is a precursor that will get converted to that actual drug we need, inside our body—usually by the liver, but not always. An example in this case is T4, which by definition is a pro-drug and won’t always get correctly converted to the T3 that a thyroid patient needs.
Well that does indeed sound worthy of criticism. But what does she advise instead?
First, she recommends a different diagnostic tool
Instead of (or at least, in addition to) TSH tests, she advises to ask for TPO tests (thyroid peroxidase), and a test for Tg antibodies (thyroglobulin). She says these are elevated for many years before a change in TSH is seen.
Next, identify the root cause and triggers
These can differ from person to person, but in countries that add iodine to salt, that’s often a big factor. And while gluten may or may not be a factor, there’s a strong correlation between celiac disease and Hashimoto’s disease, so it is worth checking too. Same goes for lactose.
By “checking”, here we mean testing eliminating it and seeing whether it makes a difference to energy levels—this can be slow, though, so give it time! It is best to do this under the guidance of a specialist if you can, of course.
Next, get to work on repairing your insides.
Remember we said “this can be slow”? It’s because your insides won’t necessarily bounce back immediately from whatever they’ve been suffering from for what’s likely many years. But, better late than never, and the time will pass anyway, so might as well get going on it.
For this, she recommends a gut-healthy diet with specific dietary interventions for hypothyroidism. Rather than repeat ourselves unduly here, we’ll link to a couple of previous articles of ours, as her recommendations match these:
She also recommends regular blood testing to see if you need supplementary TSH, TPO antibodies, and T3 and T4 hormones—as well as vitamin B12.
Short version
After diagnosis, she recommends the three Rs:
- Remove the causes and triggers of your hypothyroidism, so far as possible
- Repair the damage caused to your body, especially your gut
- Replace the thyroid hormones and related things in which your body has become deficient
Learn more
If you’d like to learn more about this, she offers a resource page, with resources ranging from on-screen information, to books you can get, to links to hook you up with blood tests if you need them, as well as recommended supplements to consider.
She also has a blog, which has an interesting relevant article added weekly.
Enjoy, and take care of yourself!
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- Thyroid patients are not diagnosed appropriately.
Turmeric (Curcumin) Dos and Don’ts With Dr. Kim
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Turmeric is a fabulous spice, most well-known for its anti-inflammatory powers; its antioxidant effects benefit all of the body, including the brain. While it fights seemingly everything from arthritis to atherosclerosis to Alzheimer’s and more, it also boosts brain-derived neurotrophic factor, looks after your cardiovascular health, holds back diabetes, reduces the risk of cancer, fights depression, slows aging, and basically does everything short of making you sing well too.
Dr. Leonid Kim goes over the scientific evidence for these, and also talks about some of the practicalities of taking turmeric, and safety considerations.
For the most part, turmeric is very safe even at high doses (up to 8g at least); indeed, at smaller doses (e.g. 500mg) it largely does the same job as non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, with fewer problems.
It also does the job of several antidiabetic medications, by increasing uptake of glucose (thus reducing blood sugar levels) while simultaneously decreasing the glucose secretion from the liver. It does this by regulating the AMPK signalling pathway, just like metformin—while again, being safer.
Dr. Kim also looks at the (good!) evidence for turmeric in managing PCOS and undoing NAFLD; so far, so good.
Dosage: he bids us pay attention whether we’re taking it as turmeric itself or as curcumin standardized extract. The latter is the active compound, and in principle more powerful, but in practice it can get metabolized too quickly and easily—before it can have its desired effect. So, turmeric itself is a very good choice.
Absorption: since we do want it to be absorbed well, though, he does recommend taking it with piperine (as in black pepper).
You may be thinking: isn’t this going to cause the same problem you were just talking about, and cause it to be metabolized too quickly? And the answer is: no! How piperine works is almost the opposite; it protects the curcumin in the turmeric from our digestive enzymes, and thus allows them to get absorbed without being broken down too quickly—thus increasing the bioavailability by slowing the process down.
Lipophilia: no, that’s not a disease (or a fetish), rather it means that curcumin is soluble in fats, so we should take it near in time to a meal that contains at least a tablespoon of oil in total (so if you’re cooking a curry with your turmeric, this need is covered already, for example).
Supplement provenance: he recommends picking a supplement that’s been tested by a reputable 3rd party, as otherwise turmeric can be quite prone to impurities (which can include lead and arsenic, so, not great).
Contraindications: for some people, curcumin can cause gastrointestinal issues (less likely if taking with meals), and also, it can interact with blood-thinners. While taking aspirin or curcumin alone might help avoid circulatory problems, taking both could increase the bleeding risk for some people, for example. Similarly, if taking curcumin and metformin while diabetic, one must watch out for the combination being too effective at lowering blood sugar levels, and thus causing hypoglycemia instead. Similar deal with blood pressure medications.
There’s more in the video though (yes really; we know we wrote a lot but it’s information-dense), so do check it out:
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Want to know more?
You can also check out our related articles:
Why Curcumin (Turmeric) Is Worth Its Weight In Gold
Black Pepper’s Impressive Anti-Cancer Arsenal (And More)Don’t Forget…
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