There seems to be a change in eye color reported among many people who follow the RAF diet which seems to describe eyes becoming lighter than before. My eyes appear to be much bluer and lighter than before so I put some stock in these claims.
It seems plausible to me that, considering at least these affects noticed by people who have followed the diet, that a better absorption or metabolization of cysteine into glutathione in a RAF diet could be at least partially responsible for many of the health benefits and directly responsible for some of them.
I don't know of any reports of a change in hair color. I would love it if I went back to my childhood blond but I would be very surprised as well.
It is quite true that many RPDers have reported a change in eye-colour to the lighter side of the spectrum. Usually, Caucasians get green or blue eyes while nonwhites get amber-coloured eyes. For my own part, I've noticed an extremely slow change in my (brown) eyes as the outer part of the iris is now more or less green. I'm not sure if I can describe it as purely as a sign of increasing health as the colour of my irises did not always alter slightly at the same time I got a spurt in increased health after going rawpalaeo. I've aslo heard claims that people change eye-colour more quickly if dairy is consumed, though I can't verify that - in my own case, consuming raw dairy via experiments actually quickly darkened my irises more(with my irises being almost coal-black over decades of dairy-consumption up till pre-rawpalaeodiet)
I seriously doubt the cysteine theory given the unclear connection between eye-colour and state of health, but I think it's clear that it would be better absorbed into the body via raw foods than cooked foods.
