🔄FROM THE ARCHIVE It comes down to the sympathetic nervous system and a common hormone.
Sign up for our email newsletter for the latest science newsIt's a well-burnished saying: Stress makes your hair turn gray. But is there actually a correlation between stress and losing the natural color of your locks?there is, in fact, a direct link between stress and graying. Over the past two decades, researchers have found preliminary evidence that stressin initiating the graying process. But our understanding of how that works has been murky — until now.
at Harvard University. For example, the researchers first assumed that hair graying was driven by a reaction from the immune system or the release of stress hormones. “When we eventually realized the sympathetic nervous system was driving the process, that was really a surprise,” Hsu wrote in an email.we get due to a scare or a cold breeze. But when we're stressed, the sympathetic nervous system triggers the release of a chemical called noradrenaline that primes us for action. It's good in situations where we need to be physically roused, but has an unfortunate side effect for our hair.
As we age, our hair can also turn gray as we lose melanocytes, though it's not necessarily because of stress.
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