Can a fright re­ally turn hair white?

BBC Earth (Asia) - - Q & A - LV

Hair fol­li­cles nat­u­rally pro­duce bleach­ing hy­dro­gen per­ox­ide but this is nor­mally mopped up by the en­zyme cata­lase. As we age, cata­lase pro­duc­tion slows and the hair bleaches it­self white or grey. But you have to wait for the hair to grow from the root – once hair emerges from your scalp it is dead. Se­vere stress could the­o­ret­i­cally cause the im­mune sys­tem to cause dark hairs to fall out, leav­ing just the white ones be­hind. Nonethe­less, there are no sci­en­tif­i­cally doc­u­mented cases of this hap­pen­ing af­ter a fright.

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