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Lumifer comments on Optimal eating (or rather, a step in the right direction) - Less Wrong Discussion
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One obvious example is lactose tolerance. It's a fairly new adaptation and it seems to have started in Northern Europe. If your ancestors come from there, you're much more likely to tolerate milk as an adult -- compared to, say, most of Asia where lactose tolerance is rare.
This is, in fact, the only example I have heard of of different food preferences across ethnic groups. But in this case there is only one change to be made - removing milk from the diet - and regardless, some europeans are lactose intolerant too. So rather than reasoning based on ethnic group which corrlates with lactose intolerance, you might as well just reason based on lactose intolerance, since it is something which can be diagnosed.
I'm not sure it exactly counts as food, but there are substantial geographical variations in genes related to alcohol metabolism.