How stress makes your hair go gray

Those annoying gray hairs that tend to crop up with age really are signs of stress, according to a new study.

The research, published in the journal Nature, found that stress activates nerves that are part of the fight-or-flight response, which in turn cause permanent damage to pigment-regenerating stem cells in hair follicles.

“We wanted to understand if this connection is true, and if so, how stress leads to changes in diverse tissues. Hair pigmentation is such an accessible and tractable system to start with — and besides, we were genuinely curious to see if stress indeed leads to hair graying,” said study senior author Ya-Chieh Hsu from Harvard University in the US.

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