Heal & Reenergize Your Brain With Optimized Sleep Cycles

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Sometimes 8 hours sleep can result in grogginess while 6 hours can result in waking up fresh as a daisy, so what gives? Dr. Tracey Marks explains, in this short video.

Getting more than Zs in

Sleep involves 90-minute cycles, usually in 4 stages:

  1. Stage 1: (drowsy state): brief muscle jerks; lasts a few minutes.
  2. Stage 2: (light sleep): sleep spindles for memory consolidation; 50% of total sleep.
  3. Stage 3 (deep sleep): tissue repair, immune support, brain toxin removal via the glymphatic system.
  4. Stage 4 (REM sleep): emotional processing, creativity, problem-solving, and dreaming.

Some things can disrupt some or all of those. To give a few common examples:

  • Alcohol: impairs REM sleep.
  • Caffeine: hinders deep sleep even if consumed hours before bed.
  • Screentime: delays sleep onset due to blue light (but not by much); the greater problem is that it can also disrupt REM sleep due to mental stimulation.

To optimize things, Dr. Marks recommends:

  • 90-minute rule: plan sleep to align with full cycles (e.g: 22:30 to 06:00 = 7½ hours, which is 5x 90-minute cycles).
  • Smart alarms: use sleep-tracking apps with built-in alarm, to wake you up during light sleep phases.
  • Strategic naps: keep naps to 20 minutes or a full 90-minute cycle.
  • Pink noise: improves deep sleep.
  • Meal timing: avoid eating within 3 hours of bedtime.
  • Natural light: get morning light exposure in the morning to strengthen circadian rhythm.

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:

Calculate (And Enjoy) The Perfect Night’s Sleep

Take care!

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  • The Fascinating Truth About Aspartame, Cancer, & Neurotoxicity

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    Is Aspartame’s Reputation Well-Deserved?

    A bar chart showing the number of people who are interested in social media and Aspartame.

    In Tuesday’s newsletter, we asked you for your health-related opinions on aspartame, and got the above-depicted, below-described, set of responses:

    • About 47% said “It is an evil carcinogenic neurotoxin”
    • 20% said “It is safe-ish, but has health risks that are worse than sugar”
    • About 19% said “It is not healthy, but better than sugar”
    • About 15% said “It’s a perfectly healthy replacement for sugar”

    But what does the science say?

    Aspartame is carcinogenic: True or False?

    False, assuming consuming it in moderation. In excess, almost anything can cause cancer (oxygen is a fine example). But for all meaningful purposes, aspartame does not appear to be carcinogenic. For example,

    ❝The results of these studies showed no evidence that these sweeteners cause cancer or other harms in people.❞

    ~ NIH | National Cancer Institute

    Source: Artificial Sweeteners and Cancer

    Plenty of studies and reviews have also confirmed this; here are some examples:

    Why then do so many people believe it causes cancer, despite all the evidence against it?

    Well, there was a small study involving giving megadoses to rats, which did increase their cancer risk. So of course, the popular press took that and ran with it.

    But those results have not been achieved outside of rats, and human studies great and small have all been overwhelmingly conclusive that moderate consumption of aspartame has no effect on cancer risk.

    Aspartame is a neurotoxin: True or False?

    False, again assuming moderate consumption. If you’re a rat being injected with a megadose, your experience may vary. But a human enjoying a diet soda, the aspartame isn’t the part that’s doing you harm, so far as we know.

    For example, the European Food Safety Agency’s scientific review panel concluded:

    ❝there is still no substantive evidence that aspartame can induce such effects❞

    ~ Dr. Atkin et al (it was a pan-European team of 21 experts in the field)

    Source: Report on the Meeting on Aspartame with National Experts

    See also,

    ❝The data from the extensive investigations into the possibility of neurotoxic effects of aspartame, in general, do not support the hypothesis that aspartame in the human diet will affect nervous system function, learning or behavior.

    The weight of existing evidence is that aspartame is safe at current levels of consumption as a nonnutritive sweetener.❞

    ~ Dr. Magnuson et al.

    Source: Aspartame: A Safety Evaluation Based on Current Use Levels, Regulations, and Toxicological and Epidemiological Studies

    and

    ❝The safety testing of aspartame has gone well beyond that required to evaluate the safety of a food additive.

    When all the research on aspartame, including evaluations in both the premarketing and postmarketing periods, is examined as a whole, it is clear that aspartame is safe, and there are no unresolved questions regarding its safety under conditions of intended use.❞

    ~ Dr. Stegink et al.

    Source: Regulatory Toxicology & Pharmacology | Aspartame: Review of Safety

    Why then do many people believe it is a neurotoxin? This one can be traced back to a chain letter hoax from about 26 years ago; you can read it here, but please be aware it is an entirely debunked hoax:

    Urban Legends | Aspartame Hoax

    Take care!

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  • 16 Overlooked Autistic Traits In Women

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    We hear a lot about “autism moms”, but Taylor Heaton is an autistic mom, diagnosed as an adult, and she has insights to share about overlooked autistic traits in women.

    The Traits

    • Difficulty navigating romantic relationships: often due to misreading signs
    • Difficulty understanding things: including the above, but mostly: difficulty understanding subtext, when people leave things as “surely obvious”. Autistic women are likely to be aware of the possible meanings, but unsure which it might be, and may well guess wrongly.
    • Masking: one of the reasons for the gender disparity in diagnosis is that autistic women are often better at “masking”, that is to say, making a conscious effort to blend in to allistic society—often as a result of being more societally pressured to do so.
    • Honesty: often to a fault
    • Copy and paste: related to masking, this is about consciously mirroring others in an effort to put them at ease and be accepted
    • Being labelled sensitive and/or gifted: usually this comes at a young age, but the resultant different treatment can have a lifetime effect
    • Secret stims: again related to masking, and again for the same reasons that displaying autistic symptoms is often treated worse in women, autistic women’s stims tend to be more subtle.
    • Written communication: autistic women are often more comfortable with the written word than the spoken
    • Leadership: autistic women will often gravitate to leadership roles, partly as a survival mechanism
    • Gaslighting: oneself, e.g. “If this person did this without that, then I can to” (without taking into account that maybe the circumstances are different, or maybe they actually did lean on crutches that you didn’t know were there, etc).
    • Inner dialogue: rich inner dialogue, but unable to express it outwardly—often because of the sheer volume of thoughts per second.
    • Fewer female friends: often few friends overall, for that matter, but there’s often a gender imbalance towards male friends, or where there isn’t, towards more masculine friends at least.
    • Feeling different: often a matter of feeling one does not meet standard expectations in some fashion
    • School: autistic women are often academically successful
    • Special interests: often more “socially accepted” interests than autistic men’s.
    • Flirting: autistic women are often unsure how to flirt or what to do about it, which can result in simple directness instead

    For more details on all of these, enjoy:

    Click Here If The Embedded Video Doesn’t Load Automatically!

    Related reading:

    You might like a main feature of ours from not long back:

    Miss Diagnosis: Anxiety, ADHD, & Women

    Take care!

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  • Why Some Friendships Last And Others Don’t

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    Friendships matter a lot, playing a significant role in our wellbeing, physical as well as mental. They bring additional meaning to our lives, help us cope with setbacks, and hopefully will be at our side through the highs and lows of life. And yet, for something that’s in principle good for everyone involved, there can be problems:

    Friend to the end?

    Firstly, some people find it harder to make (and then further deepen) friendships with others, which can be for a whole host of reasons.

    Approaching new people can feel intimidating, but it’s a common struggle. Research shows that people often underestimate how much others enjoy their company, a phenomenon known as the “liking gap.” By reminding ourselves that others are likely to appreciate our presence and expecting to be well-received (the “acceptance prophecy”), we can approach social interactions with greater confidence.

    As relationships grow, they often deepen through companionship and closeness:

    • Companionship arises from shared hobbies, interests, or values, and it builds rapport.
    • Closeness involves sharing thoughts, feelings, and experiences, which can build intimacy together.

    An important key to these is consistency, which—whether through regular chats, honoring plans, or showing support—helps strengthen bonds, even in long-distance friendships (something often considered a barrier to closeness).

    Even the strongest friendships can face challenges, of course. Conflicts may arise from a lack of support during difficult moments, or worse, betrayal. Or it could all be a misunderstanding. These situations are best addressed through honest, non-judgmental conversations. Avoiding defensiveness or accusations, and instead focusing on sharing feelings and understanding the other person’s perspective, can turn these tough discussions into opportunities for growth and stronger connections.

    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:

    How To Beat Loneliness & Isolation

    Take care!

    Share This Post

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  • From straight to curly, thick to thin: here’s how hormones and chemotherapy can change your hair

    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.

    Head hair comes in many colours, shapes and sizes, and hairstyles are often an expression of personal style or cultural identity.

    Many different genes determine our hair texture, thickness and colour. But some people’s hair changes around the time of puberty, pregnancy or after chemotherapy.

    So, what can cause hair to become curlier, thicker, thinner or grey?

    Curly or straight? How hair follicle shape plays a role

    Hair is made of keratin, a strong and insoluble protein. Each hair strand grows from its own hair follicle that extends deep into the skin.

    Curly hair forms due to asymmetry of both the hair follicle and the keratin in the hair.

    Follicles that produce curly hair are asymmetrical and curved and lie at an angle to the surface of the skin. This kinks the hair as it first grows.

    The asymmetry of the hair follicle also causes the keratin to bunch up on one side of the hair strand. This pulls parts of the hair strand closer together into a curl, which maintains the curl as the hair continues to grow.

    Follicles that are symmetrical, round and perpendicular to the skin surface produce straight hair.

    A diagram shows the hair follicle shape of straight, curly and coiled hair.
    Each hair strand grows from its own hair follicle.
    Mosterpiece/Shutterstock

    Life changes, hair changes

    Our hair undergoes repeated cycles throughout life, with different stages of growth and loss.

    Each hair follicle contains stem cells, which multiply and grow into a hair strand.

    Head hairs spend most of their time in the growth phase, which can last for several years. This is why head hair can grow so long.

    Let’s look at the life of a single hair strand. After the growth phase is a transitional phase of about two weeks, where the hair strand stops growing. This is followed by a resting phase where the hair remains in the follicle for a few months before it naturally falls out.

    The hair follicle remains in the skin and the stems cells grow a new hair to repeat the cycle.

    Each hair on the scalp is replaced every three to five years.

    A woman with curly hair works on her computer.
    Each hair on the scalp is replaced every three to five years.
    Just Life/Shutterstock

    Hormone changes during and after pregnancy alter the usual hair cycle

    Many women notice their hair is thicker during pregnancy.

    During pregnancy, high levels of oestrogen, progesterone and prolactin prolong the resting phase of the hair cycle. This means the hair stays in the hair follicle for longer, with less hair loss.

    A drop in hormones a few months after delivery causes increased hair loss. This is due to all the hairs that remained in the resting phase during pregnancy falling out in a fairly synchronised way.

    Hair can change around puberty, pregnancy or after chemotherapy

    This is related to the genetics of hair shape, which is an example of incomplete dominance.

    Incomplete dominance is when there is a middle version of a trait. For hair, we have curly hair and straight hair genes. But when someone has one curly hair gene and one straight hair gene, they can have wavy hair.

    Hormonal changes that occur around puberty and pregnancy can affect the function of genes. This can cause the curly hair gene of someone with wavy hair to become more active. This can change their hair from wavy to curly.

    Researchers have identified that activating specific genes can change hair in pigs from straight to curly.

    Chemotherapy has very visible effects on hair. Chemotherapy kills rapidly dividing cells, including hair follicles, which causes hair loss. Chemotherapy can also have genetic effects that influence hair follicle shape. This can cause hair to regrow with a different shape for the first few cycles of hair regrowth.

    A woman with wavy hair looks in a mirror
    Your hair can change at different stages of your life.
    Igor Ivakhno/Shutterstock

    Hormonal changes as we age also affect our hair

    Throughout life, thyroid hormones are essential for production of keratin. Low levels of thyroid hormones can cause dry and brittle hair.

    Oestrogen and androgens also regulate hair growth and loss, particularly as we age.

    Balding in males is due to higher levels of androgens. In particular, high dihydrotestosterone (sometimes shortened to DHT), which is produced in the body from testosterone, has a role in male pattern baldness.

    Some women experience female pattern hair loss. This is caused by a combination of genetic factors plus lower levels of oestrogen and higher androgens after menopause. The hair follicles become smaller and smaller until they no longer produce hairs.

    Reduced function of the cells that produce melanin (the pigment that gives our hair colour) is what causes greying.The Conversation

    Theresa Larkin, Associate professor of Medical Sciences, University of Wollongong

    This article is republished from The Conversation under a Creative Commons license. Read the original article.

    Don’t Forget…

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  • Dietary Changes for Artery Health

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    It’s Q&A Day at 10almonds!

    Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!

    In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!

    As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!

    So, no question/request too big or small

    ❝How does your diet change clean out your arteries of the bad cholesterol?❞

    There’s good news and bad news here, and they can both be delivered with a one-word reply:

    Slowly.

    Or rather: what’s being cleaned out is mostly not the LDL (bad) cholesterol, but rather, the result of that.

    When our diet is bad for cardiovascular health, our arteries get fatty deposits on their walls. Cholesterol gets stuck here too, but that’s not the main physical problem.

    Our body’s natural defenses come into action and try to clean it up, but they (for example macrophages, a kind of white blood cell that consumes invaders and then dies, before being recycled by the next part of the system) often get stuck and become part of the buildup (called atheroma), which can lead to atherosclerosis and (if calcium levels are high) hardening of the arteries, which is the worst end of this.

    This can then require medical attention, precisely because the body can’t remove it very well—especially if you are still maintaining a heart-unhealthy diet, thus continuing to add to the mess.

    However, if it is not too bad yet, yes, a dietary change alone will reverse this process. Without new material being added to the arterial walls, the body’s continual process of rejuvenation will eventually fix it, given time (free from things making it worse) and resources.

    In fact, your arteries can be one of the quickest places for your body to make something better or worse, because the blood is the means by which the body moves most things (good or bad) around the body.

    All the more reason to take extra care of it, since everything else depends on it!

    You might also like our previous main feature:

    All Things Heart Health

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  • Falling: Is It Due To Age Or Health Issues?

    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.

    It’s Q&A Day at 10almonds!

    Have a question or a request? We love to hear from you!

    In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!

    As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!

    So, no question/request too big or small 😎

    ❝What are the signs that a senior is falling due to health issues rather than just aging?❞

    Superficial answer: having an ear infection can result in a loss of balance, and is not particularly tied to age as a risk factor

    More useful answer: first, let’s consider these two true statements:

    • The risks of falling (both the probability and the severity of consequences) increase with age
    • Health issues (in general) tend to increase with age

    With this in mind, it’s difficult to disconnect the two, as neither exist in a vacuum, and each is strongly associated with the other.

    So the question is easier to answer by first flipping it, to ask:

    ❝What are the health issues that typically increase with age, that increase the chances of falling?❞

    A non-exhaustive list includes:

    • Loss of strength due to sarcopenia (reduced muscle mass)
    • Loss of mobility due to increased stiffness (many causes, most of which worsen with age)
    • Loss of risk-awareness due to diminished senses (for example, not seeing an obstacle until too late)
    • Loss of risk-awareness due to reduced mental focus (cognitive decline producing absent-mindedness)

    Note that in the last example there, and to a lesser extent the third one, reminds us that falls also often do not happen in a vacuum. There is (despite how it may sometimes feel!) no actual change in our physical relationship with gravity as we get older; most falls are about falling over things, even if it’s just one’s own feet:

    The 4 Bad Habits That Cause The Most Falls While Walking

    Disclaimer: sometimes a person may just fall down for no external reason. An example of why this may happen is if a person’s joint (for example an ankle or a knee) has a particular weakness that means it’ll occasionally just buckle and collapse under one’s own weight. This doesn’t even have to be a lot of weight! The weakness could be due to an old injury, or Ehlers-Danlos Syndrome (with its characteristic joint hypermobility symptoms), or something else entirely.

    Now, notice how:

    • all of these things can happen at any age
    • all of these things are more likely to happen the older we get
    • none of these things have to happen at any age

    That last one’s important to remember! Aging is often viewed as an implacable Behemoth, but the truth is that it is many-faceted and every single one of those facets can be countered, to a greater or lesser degree.

    Think of a room full of 80-year-olds, and now imagine that…

    • One has the hearing of a 20-year-old
    • One has the eyesight of a 20-year-old
    • One has the sharp quick mind of a 20-year-old
    • One has the cardiovascular fitness of a 20-year-old

    …etc. Now, none of those things in isolation is unthinkable, so remember, there is no magic law of the universe saying we can’t have each of them:

    Age & Aging: What Can (And Can’t) We Do About It?

    Which means: that goes for the things that increase the risk of falling, too. In other words, we can combat sarcopenia with protein and resistance training, maintain our mobility, look after our sensory organs as best we can, nourish our brain and keep it sharp, etc etc etc:

    Train For The Event Of Your Life! (Mobility As A Long-Term “Athletic” Goal For Personal Safety)

    Which doesn’t mean: that we will necessarily succeed in all areas. Your writer here, broadly in excellent health, and whose lower body is still a veritable powerhouse in athletic terms, has a right ankle and left knee that will sometimes just buckle (yay, the aforementioned hypermobility).

    So, it becomes a priority to pre-empt the consequences of that, for example:

    • being able to fall with minimal impact (this is a matter of knowing how, and can be learned from “soft” martial arts such as aikido), and
    • ensuring the skeleton can take a knock if necessary (keeping a good balance of vitamins, minerals, protein, etc; keeping an eye on bone density).

    See also:

    Fall Special ← appropriate for the coming season, but it’s about avoiding falling, and reducing the damage of falling if one does fall, including some exercises to try at home.

    Take care!

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