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Your hair doesn't actually "turn" gray -- it grows in this way. Every day, hairs fall out and new ones replace them. At any given time, about 85% to 90% of your hairs are actively growing, while the rest are in a resting state.
Typically, one strand grows for two to four years. It then naturally enters a resting state for about two to four months, after which it falls out and is replaced by a new hair. On average, most people lose about 50 to 100 strands of head hair a day.
Although it may seem like you "went gray overnight," in reality the gray strands become more noticeable in the normal course of shedding. Darker hairs normally hide the graying strands when they first come in.
"It is often the case that when you hear the story about somebody's hair turning white overnight, it's because they have hair that is mixed, and the darker hair is more prominent until it begins falling out," Dr. Meyer says. This is especially true for people with telogen effluvium, a temporary condition in which a major stress, such as severe illness, surgery or sudden weight loss, speeds up shedding to 300 hairs a day.
Originally posted by wcitizen
No, but I suspect the toxins in our food and water do contribute significantly.