What causes hair to turn gray?

DEAR DOCTOR K: I am a 43-year-old woman whose hair has gone quite gray in the past year. I’ve had a fairly stressful year, and since the change in my hair felt quite sudden, I’m wondering if stress could have caused it. If not, what else might be the culprit?
DEAR READER: It’s easy to assume that stress causes gray hair, because there appears to be evidence all around us. Take President Barack Obama as an example. Compare photos of Obama taken before he ran for president to more recent pictures. You’ll notice a distinct difference. His hair used to be consistently dark brown. Now, there are areas of gray dotting the landscape. Is the stress of running a country to blame?







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