The following is taken from MSN Lifestyle:
- HOW HAIR TURNS GREY
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 phaeo-melanin (reddish yellow), combine to make all the hair colors. One hypothesis for why hair goes grey is that aging slows or stops the hair from accessing the melanin, so it comes out grey, silver, or white instead.
- GREYING IS CAUSED BY HEREDITY
When you’re born, your genes are already hardwired for when and how your hair will turn grey. This includes premature greying—people who grey before age 30 usually do so because it runs in the family. For most of us, greying 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 grey hair—although a worldwide survey showed that number was much lower, with only 6 to 23 percent of people half grey by age 50.
- RACE IS ALSO A FACTOR
In a related matter, race also determines when you’re likely to grey. In general, Caucasians gray in their mid-30s, Asians in their late-30s, and African Americans in their 40s.
- PLUCKING ONE GREY 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.
- STRESS PROBABLY PLAYS A ROLE IN GREYING
When President Obama went grey 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 grey hair, others say that there seems to be a connection between greying 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 greying hair.
- TRAUMA WON’T MAKE YOU GO GREY OVERNIGHT
Another myth is that a major shock will cause your hair to suddenly turn grey. 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.
- SMOKING MAY CAUSE YOU TO PREMATURELY GREY
Multiple studies have linked smoking with premature aging, which includes early greying. In 2013, a study found that there is a significant relationship between smoking and grey hair in people under 30. In fact, “smokers were two and half times more prone to develop PHG” or premature hair greying.
- BODY HAIR ALSO TURNS GREY
All your body hair—chest, nose, pubic, etc.—can turn grey. Body hair tends to grey at a different rate than the hair on your head, which is why some men can have grey beards and brown hair, or vice versa. By the way, dyeing grey pubic hair is a thing.
- SOMEDAY, RESEARCH MAY LEAD TO A GREY 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 grey hair. But while the idea sounds promising, history is full of tonics and creams claiming to cure grey hair. As far as we know, none of them have worked yet.
