Modern humans have all sorts of wacky diets that are probably slowly killing us in ways we don't fully recognize, but that doesn't mean we should all start eating the way people did thousands or millions of years ago, either. Drinking a "soylent green" all liquid or all processed diet doesn't sound like an optimal solution, but if grown adults want to eat fancy baby food, let them try that experiment (and I'll volunteer to be in the control group). If you want to know more about pre-historic meals, though, check out a few of these links.
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