Sleep Tracking, For Five Million Nights
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5 Sleep Phenotypes, By Actual Science
You probably know people can be broadly divided into “early birds” and “night owls”:
Early Bird Or Night Owl? Genes vs Environment
…and then the term “hummingbird” gets used for a person who flits between the two.
That’s three animals so far. If you read a book we reviewed recently, specifically this one:
The Power of When – by Dr. Michael Breus
…then you may have used the guide within to self-diagnose your circadian rhythm type (chronotype) according to Dr. Breus’s system, which divides people into bears, lions, wolves, and dolphins.
That’s another four animals. If you have a FitBit, it can “diagnose” you with being those and/or a menagerie of others, such as giraffe, hedgehog, parrot, and tortoise:
How Fitbit Developed the Sleep Profile Experience (Part 2 – Sleep Animals)
Five million nights
A team of researchers recently took a step away from this veritable zoo of 11 different animals and counting, and used a sophisticated modelling system to create a spatial-temporal map of people’s sleep habits, and this map created five main “islands” that people’s sleep habits could settle on, or sometimes move from island to island.
Those “five million nights” by the way? It was actually 5,095,798 nights! You might notice that would take from the 2020s to the 15970s to complete, so this was rather a matter of monitoring 33,152 individuals between January and October of the same year. Between them, they got those 5,095,798 nights of sleep (or in some cases, nights of little or no sleep, but still, they were there for the nights).
The five main phenotypes that the researchers found were:
- What we think of as “normal” sleep. In this phenotype, people get about eight hours of uninterrupted sleep for at least six days in a row.
- As above for half the nights, but they only sleep for short periods of time in bouts of less than three hours the other half.
- As per normal sleep, but with one interrupted night per week, consisting of a 5 hour sleep period and then broken sleep for a few more hours.
- As per normal sleep generally, but with occasional nights in which long bouts of sleep are separated by a mid-sleep waking.
- Sleeping for very short periods of time every night. This phenotype was the rarest the researchers found, and represents extremely disrupted sleep.
As you might suspect, phenotype 1 is healthier than phenotype 5. But that’s not hugely informational, as the correlation between getting good sleep and having good health is well-established. So, what did the study teach us?
❝We found that little changes in sleep quality helped us identify health risks. Those little changes wouldn’t show up on an average night, or on a questionnaire, so it really shows how wearables help us detect risks that would otherwise be missed.❞
More specifically,
❝We found that the little differences in how sleep disruptions occur can tell us a lot. Even if these instances are rare, their frequency is also telling. So it’s not just whether you sleep well or not – it’s the patterns of sleep over time where the key info hides❞
…and, which gets to the absolute point,
❝If you imagine there’s a landscape of sleep types, then it’s less about where you tend to live on that landscape, and more about how often you leave that area❞
In other words: if your sleep pattern is not ideal, that’s one thing and it’d probably be good to address it, by improving your sleep. However, if your sleep pattern changes phenotype without an obvious known reason why, this may be considered an alarm bell warning of something else that needs addressing, which may be an underlying illness or condition—meaning it can be worthwhile being a little extra vigilant when it comes to regular health screenings, in case something new has appeared.
Want to read more?
You can read the paper in full here:
Five million nights: temporal dynamics in human sleep phenotypes
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From eye exams to blood tests and surgery: how doctors use light to diagnose disease
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This is the next article in our ‘Light and health’ series, where we look at how light affects our physical and mental health in sometimes surprising ways. Read other articles in the series.
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.
megaflopp/Shutterstock 1. On-the-spot tests
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 ophthalmoscope) 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 causing your headaches.
The invention of lasers and LEDs has enabled many other miniaturised technologies to be provided at the bedside or clinic rather than in the lab.
Pulse oximetry is a famous example, where a clip attached to your finger reports how well your blood is oxygenated. It does this by measuring the different responses of oxygenated and de-oxygenated blood to different colours of light.
Pulse oximetry is used at hospitals (and sometimes at home) to monitor your respiratory and heart health. In hospitals, it is also a valuable tool for detecting heart defects in babies.
See that clip on the patient’s finger? That’s a pulse oximeter, which relies on light to monitor respiratory and heart health. CGN089/Shutterstock 2. Looking at molecules
Now, back to that blood test. Analysing a small amount of your blood can diagnose many different diseases.
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 snapshot 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 spectrometer can detect tiny amounts of these substances in the blood and determine if the biomarkers for diseases are present, and at what levels.
Light shines through the blood sample and tells us whether biomarkers for disease are present. angellodeco/Shutterstock 3. Medical imaging
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 endoscope, 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 laparoscopic surgery (also known as keyhole surgery) to diagnose and treat disease.
Doctors can insert this flexible fibre-optic tube with a camera on the end into your body. Eduard Valentinov/Shutterstock How about the future?
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:
- nanomaterials (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
- wearable optical biosensors 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
- AI tools to analyse how blood serum scatters infrared light. This has allowed researchers to build a comprehensive database of scatter patterns to detect any cancer
- a type of non-invasive imaging called optical coherence tomography for more detailed imaging of the eye, heart and skin
- fibre optic technology to deliver a tiny microscope into the body on the tip of a needle.
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.
Matthew Griffith, Associate Professor and ARC Future Fellow and Director, UniSA Microscopy and Microanalysis Facilities, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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5 Ways To Beat Afternoon Energy Slumps
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This is Nisha Vora, of Rainbow Plant Life fame. After graduating from Harvard Law School, she realized she hated being a lawyer, and pivoted completely to become what she now is 12 years later, a chef and health coach.
Here are her tips for boosting energy through the day:
Caffeine timing
If you don’t do caffeine at all, no need to change that, but if you do, Vora advises that midday is the best time for it, with a very good rationale:
- of course it should not be too late in the day, because the elimination half-life of caffeine (4–8 hours to eliminate just half of the caffeine, depending on genes, call it 6 hours as an average though honestly for most people it will either be 4 or 8, not 6) is such that it can easily interfere with sleep for most people
- because caffeine is an adenosine blocker, not an adenosine inhibitor, taking caffeine in the morning means either there’s no adenosine to block, or it’ll just “save” that adenosine for later, i.e. when the caffeine is eliminated, then the adenosine will kick in, meaning that your morning sleepiness has now been deferred to the afternoon, rather than eliminated.
Another reminder that caffeine is the “payday loan” of energy. So, midday it is. No morning sleepiness to defer, and yet also not so late as to interfere with sleep.
See also: Calculate (And Enjoy) The Perfect Night’s Sleep
Simplify what can be simplified
This one’s not from a physiological basis, but rather, that a lot of the time most of us have much of our energy being taken by constant task-switching (what gets called multitasking, but as our brain is a single processor, it really means switching rapidly between different kinds of cognition, which is not efficient). In order to avoid that energy drain, try to streamline things and make a particular effort to not only single-task, but to do so without distractions.
Counterpoint: if you have unmedicated ADHD, then chances are you’ll do better with a single small distraction chosen by you, than trying to go without distractions, because your brain will find distractions anyway, so you might as well choose one (for many people it is background music, or a podcast or TV show that one doesn’t may attention to but it’s there) as a matter of harm reduction, and that way you’ll do better at focusing on your primary task than if your brain were reaching out for every and any possible distraction.
Manage your blood sugars
In particular, she advocates for avoiding sugary breakfasts, opting instead for protein, fat, and fiber-rich options. For more in this regard, see:
10 Ways To Balance Your Blood Sugars
Walk after meals
You don’t have to don hiking boots and “I am just going outside and may be some time“; rather, even a 2–5 minute walk after a meal helps regulate digestion and glucose levels, avoiding postprandial energy slumps.
So,
- if you have a treadmill, after eating is a great time to use it for a few minutes
- if you have stairs, now’s a great time to go up and down them a few times
One last technique for when everything else fails
We’ll quote her directly on this one:
❝Despite my best efforts, soemtimes I just have one of those days. Maybe I didn’t sleep well or I’m distracted by my never ending thoughts. If I need to be productive or energized on those days, I will do something that I absolutely hate:
I will take a cold shower.
And I hate it because I’m already always cold all the time, so why would I want to get a cold shower?
Well, it’s because cold water immersion has been shown to dramatically boost your dopamine levels, which gives you more energy and motivation.
In the moment though, it’s mostly painful and I hate everything and everyone around me.
But I know that if I can suffer through two minutes of a cold shower, I will feel so refreshed.❞
There are more benefits than just that, though, see:
A Cold Shower A Day Keeps The Doctor Away?
Want more from Nisha Vora?
We reviewed one of her books a while back:
The Vegan Instant Pot Cookbook – by Nisha Vora
Enjoy!
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What Does “Balance Your Hormones” Even Mean?
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Hormonal Health: Is It Really A Balancing Act?
Have you ever wondered what “balancing your hormones” actually means?
The popular view is that men’s hormones look like this:
Testosterone (less) ⟷ Testosterone (more)
…And that women’s hormones look more like this:
♀︎ Estrogen ↭ Progesterone ⤵︎
⇣⤷ FSH ⤦ ↴ ☾ ⤹⤷ Luteinizing Hormone ⤦
DHEA ↪︎ Gonadotrophin ⤾
↪︎ Testosterone? ⥅⛢
Clear as mud, right?
But, don’t worry, Supplements McHerbal Inc will sell you something guaranteed to balance your hormones!
How can a supplement (or dietary adjustment) “balance” all that hotly dynamic chaos, and make everything “balanced”?
The truth is, “balanced” in such a nebulous term, and this is why you will not hear endocrinologists using it. It’s used in advertising to mean “in good order”, and “not causing problems”, and “healthy”.
In reality, our hormone levels depend on everything from our diet to our age to our anatomy to our mood to the time of the day to the phase of the moon.
Not that the moon has an influence on our physiology at all—that’s a myth—but you know, 28 day cycle and all. And, yes, half the hormones affect the levels of the others, either directly or indirectly.
Trying to “balance” them would be quite a game of whack-a-mole, and not something that a “cure-all” single “hormone-balancing” supplement could do.
So why aren’t we running this piece on Friday, for our “mythbusting” section? Well, we could have, but the more useful information is yet to come and will take up more of today’s newsletter than the myth-busting!
What, then, can we do to untangle the confusion of these hormones?
Well first, let’s understand what they do, in the most simple terms possible:
- Estrogen—the most general feminizing hormone from puberty onwards, busiest in the beginning of the menstrual cycle, and starts getting things ready for ovulation.
- Progesterone—secondary feminizing hormone, fluffs the pillows for the oncoming fertilized egg to be implanted, increases sex drive, and adjusts metabolism accordingly. Busiest in the second half of the menstrual cycle.
- Testosterone—is also present, contributes to sex drive, is often higher in individuals with PCOS. If menopause is untreated, testosterone will also rise, because there will be less estrogen
- (testosterone and estrogen “antagonize” each other, which is the colorfully scientific way of saying they work against each other)
- DHEA—Dehydroepiandrosterone, supports production of testosterone (and estrogen!). Sounds self-balancing, but in practice, too much DHEA can thus cause elevated testosterone levels, and thus hirsutism.
- Gonadotrophin—or more specifically human chorionic gonadotrophin, HcG, is “the pregnancy hormone“, present only during pregnancy, and has specific duties relating to such. This is what’s detected in (most) pregnancy test kits.
- FSH—follicle stimulating hormone, is critical to ovulation, and is thus essential to female fertility. On the other hand, when the ovaries stop working, FSH levels will rise in a vain attempt to encourage the ovulation that isn’t going to happen anymore.
- Luteinizing hormone—says “go” to the new egg and sends it on its merry way to go get fertilized. This is what’s detected by ovulation prediction kits.
Sooooooo…
What, for most women, most often is meant by a “hormonal imbalance” is:
- Low levels of E and/or P
- High levels of DHEA and/or T
- Low or High levels of FSH
In the case of low levels of E and/or P, the most reliable way to increase these is, drumroll please… To take E and/or P. That’s it, that’s the magic bullet.
Bonus Tip: take your E in the morning (this is when your body will normally make more and use more) take your P in the evening (it won’t make you sleepy, but it will improve your sleep quality when you do sleep)
In the case of high levels of DHEA and/or T, then that’s a bit more complex:
- Taking E will antagonize (counteract) the unwanted T.
- Taking T-blockers (such as spironolactone or bicalutamide) will do what it says on the tin, and block T from doing the jobs it’s trying to do, but the side-effects are considered sufficient to not prescribe them to most people.
- Taking spearmint or saw palmetto will lower testosterone’s effects
- Scientists aren’t sure how or why spearmint works for this
- Saw palmetto blocks testosterone’s conversion into a more potent form, DHT, and so “detoothes” it a bit. It works similarly to drugs such as finasteride, often prescribed for androgenic alopecia, called “male pattern baldness”, but it affects plenty of women too.
In the case of low levels of FSH, eating leafy greens will help.
In the case of high levels of FSH, see a doctor. HRT (Hormone Replacement Therapy) may help. If you’re not of menopausal age, it could be a sign something else is amiss, so it could be worth getting that checked out too.
What can I eat to boost my estrogen levels naturally?
A common question. The simple answer is:
- Flaxseeds and soy contain plant estrogens that the body can’t actually use as such (too incompatible). They’ve lots of high-quality nutrients though, and the polyphenols and isoflavones can help with some of the same jobs when it comes to sexual health.
- Fruit, especially peaches, apricots, blueberries, and strawberries, contain a lot of lignans and also won’t increase your E levels as such, but will support the same functions and reduce your breast cancer risk.
- Nuts, especially almonds (yay!), cashews, and pistachios, contain plant estrogens that again can’t be used as bioidentical estrogen (like you’d get from your ovaries or the pharmacy) but do support heart health.
- Leafy greens and cruciferous vegetables support a lot of bodily functions including good hormonal health generally, in ways that are beyond the scope of this article, but in short: do eat your greens!
Note: because none of these plant-estrogens or otherwise estrogenic nutrients can actually do the job of estradiol (the main form of estrogen in your body), this is why they’re still perfectly healthy for men to eat too, and—contrary to popular “soy boy” social myths—won’t have any feminizing effects whatsoever.
On the contrary, most of the same foods support good testosterone-related health in men.
The bottom line:
- Our hormones are very special, and cannot be replaced with any amount of herbs or foods.
- We can support our body’s natural hormonal functions with good diet, though.
- Our hormones naturally fluctuate, and are broadly self-correcting.
- If something gets seriously out of whack, you need an endocrinologist, not a homeopath or even a dietician.
In case you missed it…
We gave a more general overview of supporting hormonal health (including some hormones that aren’t sex hormones but are really important too), back in February.
Check it out here: Healthy Hormones And How To Hack Them
Want to read more?
Anthea Levi, RD, takes much the same view:
❝For some ‘hormone-balancing’ products, the greatest risk might simply be lost dollars. Others could come at a higher cost.❞
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Unbroken – by Dr. MaryCatherine McDonald
10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.
We’ve reviewed books about trauma before, so what makes this one different? Mostly, it’s the different framing.
Dr. McDonald advocates for a neurobiological understanding of trauma, which really levels the playing field when it comes to different types of trauma that are often treated very differently, when the end result in the brain is more or less the same.
Does this mean she proposes a “one-size fits all” approach? Kind of!
Insofar as she offers a one-size fits all approach that is then personalized by the user, but most of her advices will go for most kinds of trauma in any case. This is particularly useful for any of us who’ve ever hit a wall with therapists when they expect a person to only be carrying one major trauma.
Instead, with Dr. McDonald’s approach, we can take her methods and use them for each one.
After an introduction and overview, each chapter contains a different set of relevant psychological science explored through a case study, and then at the end of the chapter, tools to use and try out.
The style is very light and readable, notwithstanding the weighty subject matter.
Bottom line: if you’ve been trying to deal with (or avoid dealing with) some kind(s) of trauma, this book will doubtlessly contain at least a few new tools for you. It did for this reviewer, who reads a lot!
Click here to check out Unbroken, because it’s never too late to heal!
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Shrimp vs Caviar – Which is Healthier?
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Our Verdict
When comparing shrimp to caviar, we picked the caviar.
Why?
Both of these seafoods share a common history (also shared with lobster, by the way) of “nutrient-dense peasant-food that got gentrified and now it’s more expensive despite being easier to source”. But, cost and social quirks aside, what are their strengths and weaknesses?
In terms of macros, both are high in protein, but caviar is much higher in fat. You may be wondering: are the fats healthy? And the answer is that it’s a fairly even mix between monounsaturated (healthy), polyunsaturated (healthy), and saturated (unhealthy). The fact that caviar is generally enjoyed in very small portions is its saving grace here, but quantity for quantity, shrimp is the natural winner on macros.
…unless we take into account the omega-3 and omega-6 balance, in which case, it’s worthy of note that caviar has more omega-3 (which most people could do with consuming more of) while shrimp has more omega-6 (which most people could do with consuming less of).
When it comes to vitamins, caviar has more of vitamins A, B1, B2, B5, B6, B9, B12, D, K, and choline; nor are the margins small in most cases, being multiples (or sometimes, tens of multiples) higher. Shrimp, meanwhile, boasts only more vitamin B3.
In the category of minerals, caviar leads with more calcium, iron, magnesium, manganese, phosphorus, potassium, and selenium, while shrimp has more copper and zinc.
All in all, while shrimp has its benefits for being lower in fat (and thus also, for those whom that may interest, lower in calories), caviar wins the day by virtue of its overwhelming nutritional density.
Want to learn more?
You might like to read:
What Omega-3 Fatty Acids Really Do For Us
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Buckwheat vs Bulgur Wheat – Which is Healthier?
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Our Verdict
When comparing buckwheat to bulgur, we picked the buckwheat.
Why?
First, some things to know up front:
- Bulgur wheat is a kind of cracked wheat product. As such, it contains wheat, and yes, gluten.
- Buckwheat is not a wheat, nor even a grass, but a flowering plant. Buckwheat is as related to wheat as a lionfish is to a lion. It does not contain gluten.
- Buckwheat can be purchased whole or hulled. We went with whole. If you go with hulled, the percentages of vitamins and minerals will be relatively higher, and/but this will be because you lost the fibrous husk, so they’ll be commensurately lower in fiber. If you were to go with hulled, we’d still pick it over bulgur wheat though, just for a different reason (as in that case, the vitamin and mineral contents would be more overwhelmingly in buckwheat’s favor, even though it’d have less fiber).
Ok, now that those things are covered…
Looking at the macronutrients, there’s not a lot between them, except that buckwheat has the much lower glycemic index (this is only the case if you got whole, not hulled—if you got hulled, the glycemic index would be about the same).
In terms of vitamins, buckwheat has more of vitamins B2, B5, B9, E, K, and choline, while bulgur wheat technically has more vitamin A, but the numbers are tiny; a cup of bulgur wheat will give you 0.12% of the RDA. So, an easy win (functionally: 5:0) for buckwheat.
When it comes to minerals, buckwheat has more copper, magnesium, potassium, and selenium, while bulgur wheat has more calcium and manganese. They’re equal on iron and phosphorus, making this a 4:2 win for buckwheat.
Adding up the categories makes this a clear win for buckwheat!
Want to learn more?
You might like to read:
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