10 Head-Scratching Facts About Gray Hair

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istock

Whether it’s no big deal or a perplexing affront to your vanity, gray hair is a fact of life—and still a bit of a mystery.

1. How Hair Turns Gray

Hair grows in a follicle, a bulb-like tube on your scalp. The average head has 100,000 to 150,000 follicles, each operating independently from the others. Hair in its basic, unpigmented state is white. It gets its color from melanin, a pigment that also determines skin color. Two types of melanin, eumelanin (dark brown or black) and phaeomelanin (reddish yellow), combine to make all the hair colors. One hypothesis for why hair goes gray is that aging slows or stops the hair from accessing the melanin, so it comes out gray, silver, or white instead.

2. Hair May Bleach Itself From The Inside Out

New research reveals that graying may be from a build-up of hydrogen peroxide in the hair cell, which causes the hair to bleach itself on the inside. Cells naturally have a small amount of hydrogen peroxide in them, but it’s kept in check by an enzyme called catalase, which converts the hydrogen peroxide to oxygen and water. As we age, the body produces less catalase, so the hydrogen peroxide builds up and, according to the New York Times, blocks “the normal synthesis of melanin, the natural pigment in hair.” Thus the hair turns gray, giving new meaning to the phrase “peroxide blonde.”

3. Graying Is Caused By Heredity

When you’re born, your genes are already hardwired for when and how your hair will turn gray. This includes premature graying—people who gray before age 30 usually do so because it runs in the family. For most of us, graying starts in middle age. Dermatologists go by the 50/50/50 rule of thumb: by age 50, half the population will have at least 50 percent gray hair—although a worldwide survey showed that number was much lower, with only 6 to 23 percent of people half gray by age 50.

4. Race Is Also A Factor

In a related matter, race also determines when you’re likely to gray. In general, Caucasians gray in their mid-30s, Asians in their late-30s, and African Americans in their 40s.

5. Plucking One Gray Hair Will Not Cause Three To Grow In Its Place

This old wives’ tale is a myth. Each follicle can contain only one hair, and plucking it won’t make it able to produce multiple hairs. Furthermore, what you do to one follicle has no effect on the ones around it. That said, excessive plucking isn’t a good idea—it can damage the follicles and even stop hair production in that area altogether.

6. Stress Probably Plays A Role In Graying

When President Obama went gray his first term in office, was it stress, age, or a combination of both? Scientists aren’t sure. While some researchers say that your genes alone are responsible for gray hair, others say that there seems to be a connection between graying and stress, just no direct link to prove it. In 2011, a study by Nobel Prize winner Robert Lefkowitz discovered that long-term productions of the body’s fight or flight response—the instinctive ability to mobilize energy in response to a threatening situation—can damage your DNA and cause premature aging, including graying hair.

7. Trauma Won’t Make You Go Gray Overnight

Another myth is that a major shock will cause your hair to suddenly turn gray. This is sometimes called the Marie Antoinette Syndrome because the French queen’s hair supposedly turned white the night before she was beheaded. But hair, once grown, doesn’t change color, so waking up with a head of white hair isn’t going to happen. Although there is a very rare condition where all of the colored hairs can fall out, leaving only white hairs behind, the simpler answer is that Marie Antoinette probably just took off her wig.

8. Smoking May Cause You To Prematurely Gray

Multiple studies have linked smoking with premature aging, which includes early graying. In 2013, a study found that there is a significant relationship between smoking and gray hair in people under 30. In fact, “smokers were two and half times more prone to develop PHG” or premature hair graying.

9. Body Hair Also Turns Gray

All your body hair—chest, nose, pubic, etc.—can turn gray. Body hair tends to gray at a different rate than the hair on your head, which is why some men can have gray beards and brown hair, or visa versa. By the way, dyeing gray pubic hair is a thing. 

10. Someday, Research May Lead To A Gray Hair Cure

Scientists in Europe discovered a breakthrough with vitiligo, a disease where skin loses pigment and develops white patches. Like hair, vitiligo is caused by “massive oxidative stress via accumulation of hydrogen peroxide,” causing the skin to bleach itself from the inside out. Researchers have successfully treated the discolored skin and eyelashes of vitiligo patients, which has led some to predict a potential cure for gray hair. But while the idea sounds promising, history is full of tonics and creams claiming to cure gray hair. As far as we know, none of them have worked yet.

Bad News: The Best Time of the Day to Drink Coffee Isn’t as Soon as You Wake Up

iStock.com/ThomasVogel
iStock.com/ThomasVogel

If you depend on coffee to help get you through the day, you can rest assured that you’re not the world's only caffeine fiend. Far from it. According to a 2018 survey, 64 percent of Americans said they had consumed coffee the previous day—the highest percentage seen since 2012.

While we’re collectively grinding more beans, brewing more pots, and patronizing our local coffee shops with increased frequency, we might not be maximizing the health and energy-boosting benefits of our daily cup of joe. According to Inc., an analysis of 127 scientific studies highlighted the many benefits of drinking coffee, from a longer average life span to a reduced risk for cancer, heart disease, type 2 diabetes, and Parkinson’s disease.

Sounds great, right? The only problem is that the benefits of coffee might be diminished depending on the time of day that you drink it. Essentially, science tells us that it’s best to drink coffee when your body’s cortisol levels are low. That’s because both caffeine and cortisol cause a stress response in your body, and too much stress is bad for your health for obvious reasons. In addition, it might end up making you more tired in the long run.

Cortisol, a stress hormone, is released in accordance with your circadian rhythms. This varies from person to person, but in general, someone who wakes up at 6:30 a.m. would see their cortisol levels peak in different windows, including 8 to 9 a.m., noon to 1 p.m., and 5:30 to 6:30 p.m. Someone who rises at 10 a.m. would experience cortisol spikes roughly three hours later, and ultra-early risers can expect to push this schedule three hours forward.

However, these cortisol levels start to rise as soon as you start moving in the morning, so it isn’t an ideal time to drink coffee. Neither is the afternoon, because doing so could make it more difficult to fall asleep at night. This means that people who wake up at 6:30 a.m. should drink coffee after that first cortisol window closes—roughly between 9:30 a.m. and 11:30 a.m.—if they want to benefit for a little caffeine jolt.

To put it simply: "I would say that mid-morning or early afternoon is probably the best time," certified dietitian-nutritionist Lisa Lisiewski told CNBC. "That's when your cortisol levels are at their lowest and you actually benefit from the stimulant itself."

[h/t Inc.]

26 Amazing Facts About the Human Body

Mental Floss via YouTube
Mental Floss via YouTube

At some point in your life, you've probably wondered: What is belly button lint, anyway? The answer, according to Mental Floss editor-in-chief Erin McCarthy, is that it's "fibers that rub off of clothing over time." And hairy people are more prone to getting it for a very specific (and kind of gross-sounding) reason. A group of scientists who formed the Belly Button Biodiversity Project in 2011 have also discovered that there's a whole lot of bacteria going on in there.

In this week's all-new edition of The List Show, Erin is sharing 26 amazing facts about the human body, from your philtrum (the dent under your nose) to your feet. You can watch the full episode below.

For more episodes like this one, be sure to subscribe here.

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