Is stress turning my hair grey?
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When we start to go grey depends a lot on genetics.
Your first grey hairs usually appear anywhere between your twenties and fifties. For men, grey hairs normally start at the temples and sideburns. Women tend to start greying on the hairline, especially at the front.
The most rapid greying usually happens between ages 50 and 60. But does anything we do speed up the process? And is there anything we can do to slow it down?
You’ve probably heard that plucking, dyeing and stress can make your hair go grey – and that redheads don’t. Here’s what the science says.
What gives hair its colour?
Each strand of hair is produced by a hair follicle, a tunnel-like opening in your skin. Follicles contain two different kinds of stem cells:
- keratinocytes, which produce keratin, the protein that makes and regenerates hair strands
- melanocytes, which produce melanin, the pigment that colours your hair and skin.
There are two main types of melanin that determine hair colour. Eumelanin is a black-brown pigment and pheomelanin is a red-yellow pigment.
The amount of the different pigments determines hair colour. Black and brown hair has mostly eumelanin, red hair has the most pheomelanin, and blonde hair has just a small amount of both.
So what makes our hair turn grey?
As we age, it’s normal for cells to become less active. In the hair follicle, this means stem cells produce less melanin – turning our hair grey – and less keratin, causing hair thinning and loss.
As less melanin is produced, there is less pigment to give the hair its colour. Grey hair has very little melanin, while white hair has none left.
Unpigmented hair looks grey, white or silver because light reflects off the keratin, which is pale yellow.
Grey hair is thicker, coarser and stiffer than hair with pigment. This is because the shape of the hair follicle becomes irregular as the stem cells change with age.
Interestingly, grey hair also grows faster than pigmented hair, but it uses more energy in the process.
Can stress turn our hair grey?
Yes, stress can cause your hair to turn grey. This happens when oxidative stress damages hair follicles and stem cells and stops them producing melanin.
Oxidative stress is an imbalance of too many damaging free radical chemicals and not enough protective antioxidant chemicals in the body. It can be caused by psychological or emotional stress as well as autoimmune diseases.
Environmental factors such as exposure to UV and pollution, as well as smoking and some drugs, can also play a role.
Melanocytes are more susceptible to damage than keratinocytes because of the complex steps in melanin production. This explains why ageing and stress usually cause hair greying before hair loss.
Scientists have been able to link less pigmented sections of a hair strand to stressful events in a person’s life. In younger people, whose stems cells still produced melanin, colour returned to the hair after the stressful event passed.
4 popular ideas about grey hair – and what science says
1. Does plucking a grey hair make more grow back in its place?
No. When you pluck a hair, you might notice a small bulb at the end that was attached to your scalp. This is the root. It grows from the hair follicle.
Plucking a hair pulls the root out of the follicle. But the follicle itself is the opening in your skin and can’t be plucked out. Each hair follicle can only grow a single hair.
It’s possible frequent plucking could make your hair grey earlier, if the cells that produce melanin are damaged or exhausted from too much regrowth.
2. Can my hair can turn grey overnight?
Legend says Marie Antoinette’s hair went completely white the night before the French queen faced the guillotine – but this is a myth.
Melanin in hair strands is chemically stable, meaning it can’t transform instantly.
Acute psychological stress does rapidly deplete melanocyte stem cells in mice. But the effect doesn’t show up immediately. Instead, grey hair becomes visible as the strand grows – at a rate of about 1 cm per month.
Not all hair is in the growing phase at any one time, meaning it can’t all go grey at the same time.
3. Will dyeing make my hair go grey faster?
This depends on the dye.
Temporary and semi-permanent dyes should not cause early greying because they just coat the hair strand without changing its structure. But permanent products cause a chemical reaction with the hair, using an oxidising agent such as hydrogen peroxide.
Accumulation of hydrogen peroxide and other hair dye chemicals in the hair follicle can damage melanocytes and keratinocytes, which can cause greying and hair loss.
4. Is it true redheads don’t go grey?
People with red hair also lose melanin as they age, but differently to those with black or brown hair.
This is because the red-yellow and black-brown pigments are chemically different.
Producing the brown-black pigment eumelanin is more complex and takes more energy, making it more susceptible to damage.
Producing the red-yellow pigment (pheomelanin) causes less oxidative stress, and is more simple. This means it is easier for stem cells to continue to produce pheomelanin, even as they reduce their activity with ageing.
With ageing, red hair tends to fade into strawberry blonde and silvery-white. Grey colour is due to less eumelanin activity, so is more common in those with black and brown hair.
Your genetics determine when you’ll start going grey. But you may be able to avoid premature greying by staying healthy, reducing stress and avoiding smoking, too much alcohol and UV exposure.
Eating a healthy diet may also help because vitamin B12, copper, iron, calcium and zinc all influence melanin production and hair pigmentation.
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.
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The Lifestyle Factors That Matter >8 Times More Than Genes
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We’ve said before that “genes predispose; they don’t predetermine”. It can be good to know one’s genes, of course, and we’ve written about this here:
Genetic Testing: Health Benefits & Methods
…which can include some quite contemporary risks, such as:
Genetic Risk Factors For Long COVID
And yet…
Nurture Over Nature
A very large (n=492,567) study looked into the impact of 25 lifestyle/environmental factors, of which 23 are considered modifiable, and found that lifestyle/environmental factors accounted for 17% of the variation in mortality risk, while genetic predisposition accounted for less than 2%.
Which is good news, because it means we can improve our lot.
But how?
The strongest negative factors (that increased mortality the most) were:
- Smoking
- Not owning your home (interestingly, “live in accommodation rent-free vs own” performed just as badly as various kinds of “renting home vs own”, while “own house with mortgage, vs own outright” had only a marginal negative effect)
- Sleeping more than 9 hours per day (performed even worse than sleeping under 7 hours per day, which also increased mortality risk, but not by as much as oversleeping)
- Financial difficulties in the past two years
- Homosexuality
- Unemployment
- Being an evening person
- Lonely lifestyle
- Frequent napping
We may hypothesize that homosexuality probably makes the list because of how it makes one more likely to have other items on the list, especially unemployment, and the various poverty-related indicators that come from unemployment.
Being an evening person, whatever its pathology, is a well-established risk factor that we’ve talked about before:
Early Bird Or Night Owl? Genes vs Environment ← this is also, by the way, an excellent example of how “genes predispose; they don’t predetermine”, because there is a genetic factor involved, and/but we absolutely can switch it up, if we go about it correctly, and become a morning person without trying to force it.
The strongest positive factors (that decreased mortality the most) were:
- The inverse of all of the various above things, e.g. never having smoked, owning your own home, etc
- Household income, specifically
- Living with a partner
- Having oil central heating
- Gym use
- Sun protection use
- Physical activity, especially if in leisure time rather than as part of one’s work
- Glucosamine supplements
- Family visit frequency
- Cereal fiber intake (i.e. whole grains)
We may hypothesize that having oil central heating is simply a more expensive option to install than many, and therefore likely one enjoyed by homeowners more often than renters.
We may hypothesize that glucosamine supplementation is an indication of the type of person who takes care of a specific condition (inflammation of the joints) without an existential threat; notably, multivitamin supplements don’t get the same benefit, probably because of their ubiquity.
We may hypothesize that “family visit frequency” is highly correlated to having a support network, being social (and thus not lonely), and likely is associated with household income too.
You can see the full list of factors and their impacts, here:
Environmental architecture of mortality in the UKB ← that’s the UK Biobank
You can read the paper in full, here:
Integrating the environmental and genetic architectures of aging and mortality
Practical takeaways
The priorities seem to be as follows:
Don’t smoke. Ideally you will never have smoked, but short of a time machine, you can’t change that now, so: what you can do is quit now if you haven’t already.
See also: Which Addiction-Quitting Methods Work Best?
Note that other factors often lumped in with such, for example daily alcohol consumption, red meat intake, processed meat intake, and salt intake, all significantly increased mortality risk, but none of them in the same league of badness as smoking.
See also: Is Sugar The New Smoking? ← simply put: no, it is not. Don’t get us wrong; added sugar is woeful for the health, but smoking is pretty much the worst thing you can do for your health, short of intentionally (and successfully) committing suicide.
Be financially secure, ideally owning your own home. For many (indeed, for most people in the world) this may be an “easier said than done” thing, but if you can make decisions that will improve your financial security, the mortality numbers are very clear on this matter.
Be social, as loneliness indeed kills, in numerous ways. Loneliness means a lack of a support network, and it means a lack of social contact (thus increased risk of cognitive decline), and likely decreased ikigai, unless your life’s purpose is something inherently linked to solitude (e.g. the “meditating on top of a mountain” archetype).
See also: What Loneliness Does To Your Brain And Body
And to fix it: How To Beat Loneliness & Isolation
Be active: especially in your leisure time; being active because you have to does convey benefits, but on the same level as physical activity because you want to.
See also: No-Exercise Exercises (That Won’t Feel Like “Having To Do” Exercise)
Use sunscreen: we’re surprised this one made the list; it’s important to avoid skin cancer of course, but we didn’t think it’d be quite such a driver of mortality risk mitigation as the numbers show it is, and we can’t think of a clear alternative explanation, as we could with some of the other “why did this make the list?” items. At worst, it could be a similar case to that of glucosamine use, and thus is a marker of a conscientious person making a regular sustained effort for their health. Either way, it seems like a good idea based on the numbers.
See also: Do We Need Sunscreen In Winter, Really?
Enjoy whole grains: fiber is super-important, and that mustn’t be underestimated!
See also: What Matters Most For Your Heart? ← hint: it isn’t about salt intake or fat
And, for that matter: The Best Kind Of Fiber For Overall Health?
Take care!
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The Distracted Mind – by Dr. Adam Gazzaley and Dr. Larry Rosen
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Yes, yes, we know, unplug once in a while. But what else do this highly-qualified pair of neuroscientists have to offer?
Rather than being a book for the sake of being a book, with lots of fluff and the usual advice about single-tasking, the authors start with a reframe:
Neurologically speaking, the hit of dopamine we get when looking for information is the exact same as the hit of dopamine that we, a couple of hundred thousand years ago, got when looking for nuts and berries.
- When we don’t find them, we become stressed, and search more.
- When we do find them, we are encouraged and search more nearby, and to the other side of nearby, and near around, to find more.
But in the case of information (be it useful information or celebrity gossip or anything in between), the Internet means that’s always available now.
So, we jitter around like squirrels, hopping from one to the next to the next.
A strength of this book is where it goes from there. Specifically, what evidence-based practices will actually keep our squirrel-brain focused… and which are wishful thinking for anyone who lives in this century.
Bringing original research from their own labs, as well as studies taken from elsewhere, the authors present a science-based toolkit of genuinely useful resources for actual focus.
Bottom line: if you think you could really optimize your life if you could just get on track and stay on track, this is the book for you.
Click here to check out The Distracted Mind, and get yours to focus!
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Almonds vs Peanuts – Which is Healthier?
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Our Verdict
When comparing almonds to peanuts, we picked the almonds.
Why?
No, it’s not just our pro-almonds bias… But it’s also not as one-sided, nutritionally speaking, as you might think!
In terms of macros, almonds have a lot more fiber, and moderately more carbs, the ratio of which give almonds the lower glycemic index. On the other hand, peanuts have a little more protein. Both of these nuts are equally fatty, but peanuts have the higher saturated fat content. All in all, we say the biggest deciding factor is the fiber, and hand this one to the almonds.
In the category of vitamins, almonds have more of vitamins B2 and E, while peanuts have more of vitamins B1, B3, B5, B6, B7, and B9. An easy win for peanuts this time.
When it comes to minerals, almonds have more calcium, magnesium, manganese, phosphorus, and potassium, while peanuts have more copper, iron, selenium, and zinc. Thus, a 5:4 marginal win for almonds.
Adding up the sections makes for an overall win for almonds, but as you can see, it was close and peanuts certainly have their merits too, so by all means enjoy either or both; diversity is good!
Unless you are allergic, in which case, obviously please don’t do that.
Want to learn more?
You might like to read:
Why You Should Diversify Your Nuts!
Enjoy!
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Machine-Dispensed Coffee & Heart Health
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We have written before about the health benefits (and risks) of coffee; for most people, the benefits far outweigh the risks, but individual cases may vary:
The Bitter Truth About Coffee (or is it?) ← this is a mythbusting edition
Speaking of bitterness; coffee has abundant polyphenols, which means…
- Coffee is the world’s biggest source of antioxidants
- 65% reduced risk of Alzheimer’s for coffee-drinkers
- 67% reduced risk of type 2 diabetes for coffee-drinkers
- 43% reduced risk of liver cancer for coffee-drinkers
- 53% reduced suicide risk for coffee-drinkers
See also: Why Bitter Is Better: Enjoy Bitter Foods For Your Heart & Brain ← while it says foods in the title, this does cover coffee too.
For mythbusting on caffeine specifically, enjoy: Caffeine: Cognitive Enhancer Or Brain-Wrecker?
There are also gut health benefits from drinking coffee, and what’s good for our gut is invariably good for our heart and brain:
Coffee & Your Gut ← gut bacteria do not, by the way, have a preference about how you make your coffee or whether it is caffeinated or not
The latest science on coffee and heart health
Specifically, on coffee and cholesterol levels, so for a quick primer on cholesterol, check out: Demystifying Cholesterol
High total cholesterol, and especially high LDL (“bad” cholesterol) is generally associated with cardiovascular disease, for the reasons outlined in the link above.
Recently, researchers at Uppsala University in Sweden examined the levels of cafestol and kahweol, which are both diterpenes, substances known to increase cholesterol levels, in coffee made by various methods, including those dispensed from coffee machines in workplaces.
Two samples were taken from each machine every 2–3 weeks, and the most common kinds of machines produced the highest concentrations of diterpenes. These machines are the ones that push hot water through a small amount of ground coffee, through a wide-gauge filter, dispensing coffee into a cup in about 30 seconds.
Actual espresso machines, which work on the same principle but usually with a finer filter, higher pressure, and slower dispensing of the drink, had widely varying results, quite possibly because there is (in most machines) a human element in how tightly the ground coffee is packed into the metal filter basket.
Simple filter coffee, whether made in a coffee percolator machine or made using the pour-over method, had the lowest concentrations of diterpenes.
You can read about this study here:
However!
We were curious as to how, exactly, cafestol and kahweol increase cholesterol levels.
It turns out that research in this area has been scant, because most mice aren’t affected by it in the way that most humans are, which has limited mouse model studies.
Scant does not mean non-existent, though, and the answer came by virtue of transgenic mice (specifically, apolipoprotein (apo) E*3-Leiden transgenic mice, which do have the same reaction to cafestol as humans), the paper title sums it up nicely:
You may be wondering: what does suppression of bile acid synthesis have to do with cholesterol levels?
To oversimplify it a bit: cafestol messes with cholesterol metabolism by interfering with the enzymes involved in cholesterol metabolism (specifically, regulatory enzymes found in bile acid).
As to what it actually does in that regard: it reduces LDLR (LDL receptor) mRNA levels by 37% (that figure’s an average of the specific enzymes, sterol 27-hydroxylase and oxysterol 7α-hydroxylase, which were reduced by 32% and 48%, respectively).
Why this matters in practical terms: cafestol does not add any cholesterol to our systems, it inhibits our ability to clear LDL cholesterol, thus promoting raised LDL cholesterol levels.
In other words: if you have little or no dietary cholesterol (no dietary cholesterol, for example, if you are vegan), then your body will only have the cholesterol that it made for itself because it needed it, and as such, the body won’t need to do the same kind of clean-up job that it would if you had that coffee with a double cheeseburger with extra bacon.
As such, if you have little or no dietary cholesterol, cafestol is unlikely to have anything like the same effect on cholesterol levels.
Disclaimer: this latter is technically a hypothesis, but based on sound reasoning:
It’s the same logic that says “if you do not drink alcohol, then eating a durian fruit, which inhibits aldehyde dehydrogenase, which the body uses to metabolize alcohol, will not cause alcohol-related problems for you”.
Want to know more?
We wrote previously on coffee and cafestol, along with some suggestions:
Health-Hack Your Coffee To Make Your Coffee Heart-Healthier!
Enjoy!
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Chatter – by Dr. Ethan Kross
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This book is about much more than just one’s internal monologue. It does tackle that, but also the many non-verbal rabbit-holes that our brains can easily disappear into.
The author is an experimental psychologist, and brings his professional knowledge and experience to bear on this problem—citing many studies, including his own studies from his own lab, in which he undertook to answer precisely the implicit questions of “How can I…” in terms of tackling these matters, from root anxiety (for example) to end-state executive dysfunction (for example).
The writing style isn’t dense science though, and is very approachable for all.
The greatest value in this book lies in its prescriptive element, that is to say, its advice, especially in the category of evidence-based things we can do to improve matters for ourselves; beyond generic things like “mindfulness-based stress reduction” to much more specific things like “observe yourself in the 3rd person for a moment” and “take a break to imagine looking back on this later” and “interrupt yourself with a brief manual task”. With these sorts of interventions and more, we can shift the voice in our head from critic to coach.
Bottom line: if you would like your brain to let you get on with the things you actually want to do instead of constantly sidetracking you, this is the book for you.
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Less Common Oral Hygiene Options
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Less Common Alternatives For Oral Hygiene!
You almost certainly brush your teeth. You might use mouthwash. A lot of people floss for three weeks at a time, often in January.
There are a lot of options for oral hygiene; variations of the above, and many alternatives too. This is a big topic, so rather than try to squeeze it all in one, this will be a several-part series.
- The first part was: Toothpastes & Mouthwashes: Which Help And Which Harm?
- The second part was: Flossing, Better (And Easier!)
- The third (and for now at least, final) part will look at some less common alternatives.
Tooth soap
The idea here is simplicity, and brushing with as few ingredients as possible. Soap cleans your teeth the same way it cleans your (sometimes compositionally quite similar—enamel and all) dishes, without damaging them.
We’d love to link to some science here, but alas, it appears to have not yet been done—at least, we couldn’t find any!
You can make your own tooth soap if you are feeling confident, or you might prefer to buy one ready-made (here’s an example product on Amazon, with various flavor options)
Oil pulling
We are getting gradually more scientific now; there is science for this one… But the (scientific) reviews are mixed:
Wooley et al., 2020, conducted a review of extant studies, and concluded:
❝The limited evidence suggests that oil pulling with coconut oil may have a beneficial effect on improving oral health and dental hygiene❞
The “Science-Based Medicine” project was less positive in its assessment, and declared that all and any studies that found oil pulling to be effective were a matter of researcher/publication bias. We would note that SBM is a private project and is not without its own biases, but for balance, here is what they had to offer:
A more rounded view seems to be that it is a good method for cleaning your teeth if you don’t have better options available (whereby, “better options” is “almost any other method”).
One final consideration, which the above seemed not to consider, is:
If you have sensitive teeth/gums, oil-pulling is the gentlest way of cleaning them, and getting them back into sufficient order that you can comfortably use other methods.
Want to try it? You can use any food-grade oil (coconut oil or olive oil are common choices).
Chewing stick
Not just any stick—a twig of the Salvadora persica tree. This time, there’s lots of science for it, and it’s uncontroversially effective:
❝A number of scientific studies have demonstrated that the miswak (Salvadora persica) possesses antibacterial, anti-fungal, anti-viral, anti-cariogenic, and anti-plaque properties.
Several studies have also claimed that miswak has anti-oxidant, analgesic, and anti-inflammatory effects. The use of a miswak has an immediate effect on the composition of saliva.
Several clinical studies have confirmed that the mechanical and chemical cleansing efficacy of miswak chewing sticks are equal and at times greater than that of the toothbrush❞
Read in full: A review of the therapeutic effects of using miswak (Salvadora Persica) on oral health
And about the efficacy vs using a toothbrush, here’s an example:
Comparative effect of chewing sticks and toothbrushing on plaque removal and gingival health
Want to try the miswak stick? Here’s an example product on Amazon.
Enjoy!
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