Anecdata, but I've witnessed re-melanizing of formerly gray follicles. My wife tried intermittent fasting after reading some health claims about it. (i.e. auto

Anecdata, but I've witnessed re-melanizing of formerly gray follicles. My wife tried intermittent fasting after reading some health claims about it. (i.e. autophagy). In the beginning I was skeptical. After a month or so of intermittent fasts, her hairdresser noticed an obvious line of salt and pepper hair that was growing in brown at the roots. I now believe the health claims of fasting have merit, and I hope future research can quantify the degree of benefits.