In past studies, researchers have asked participants to fill out questionnaires about their hair color and stress levels, and then the scientists would see if they could link them.
In one study published in 2016, for instance, scientists surveyed more than 1,100 young Turkish adults and found that the 315 who reported prematurely graying hair had higher stress levels than those who didn't.
There's still a lot we don't know, said Dr. Paradi Mirmirani, a dermatologist at the Kaiser Permanente Vallejo Medical Center in Northern California.
While some have found associations between premature graying and stress, no research has proved the link.
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