Reply #5: It's difficult to separate effects like better nutrition

[muriel_volestrangler]

from genetic changes - eg average height is more, for most groups, than it was back then.

I have heard a theory that Europeans developed better resistance to alcohol than Asians, because Europeans drank more alcoholic drinks as a way of avoiding infected water, while Asians went more to boiled water, eg tea. I don't know how much there really is to back that up, but it would have happened in the past few thousand years.