A recent study in mouse models published in Nature and performed by scientists from Harvard University showed that hair graying is associated with acute stress through the fast depletion of melanocyte stem cells. The results of this study advance knowledge of how the body is affected by stress, and are a first step toward blocking its negative effects.
Source: Bing Zhang, Sai Ma, Inbal Rachmin, et al. Hyperactivation of sympathetic nerves drives depletion of melanocyte stem cells. Nature 2020; DOI: 10.1038/s41586-020-1935-3