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Notes -
That seems pretty far-fetched to me, in that a thousand years is nowhere near long enough for human level selection effects to occur. I could perhaps buy that our gut biomes adapted to ancestral diets, but I tend to suspect old fashioned diets being better for us is more just a matter of ancestral wisdom/modern processed food being utter shit. Like, obviously a balanced meal of lean protein, grains, and mixed vegetables is gonna be better than fast food or whatever sodium loaded nonsense one picks up in the freezer aisle.
A few thousand years is certainly enough, see lactase persistance.
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