ELI5 Gray Hair - why does stress turn hair gray?

Why do people talk about graying hair as Marie Antoinette syndrome? Researchers finally think they know why stress turns your hair gray - we attempt to explain like I'm five.   ... We explain like i'm five!     Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: silver_kitty & protusmose Harvard study published in Nature: https://www.nature.com/articles/s41586-020-1935-3 To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]