Donavyn Coffey is a Kentucky-based health and environment journalist reporting on healthcare, food systems and anything you can CRISPR. Her work has appeared in Scientific American, Wired UK, Popular Science and Youth Today, among others. Donavyn was a Fulbright Fellow to Denmark where she studied molecular nutrition and food policy. She holds a bachelor's degree in biotechnology from the University of Kentucky and master's degrees in food technology from Aarhus University and journalism from New York University.
There's a long-held belief that graying hair is more than just an issue of time and age — it's a marker of lived experience. The adage,"you're making my hair gray" suggests silvering strands are a record of worries, while Marie Antoinette's hair went white in a single night after learning of her execution, according to legend.
Stress isn't the primary cause of graying — genes largely dictate when people go gray —- but"stress may accelerate" the graying process, said David Kingsley, a researcher into hair loss and president of the World Trichology Society. In the study, researchers provoked a stress response in the mice. In response, corticosterone and norepinephrine flooded into the follicle. Once in the follicle, the norepinephrine caused the stem cell to transform into a regular melanocyte, meaning it could not divide indefinitely. With the stem cell permanently changed, the follicle no longer had a source of new pigment cells. That strand of hair — or in the mouse's case, fur — lost its source of color.
"There was one individual who went on vacation, and five hairs on that person's head reverted back to dark during the vacation, synchronized in time," lead author Martin Picard , a neurologist at Columbia University said in a statement .—Alopecia: Causes, symptoms & treatments for hair loss and balding
Kingsley agreed. Melanocyte stem cells become more vulnerable as they age, he said. So added stress potentially"changes the timing" of graying, he said.
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