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SaidAchmiz comments on Rationality Quotes February 2014 - Less Wrong
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-- Christopher Ryan
But to argue that our ancestors were dietary omnivores is a criticism of vegetarianism.
One man's modus ponens...
How so?
It implies that vegeterian diets are harmful and/or suboptimal in all kinds of unforeseen ways, because we haven't evolved to tolerate them, let along optimize for them.
I take your point, though I don't think I'd go so far as to say that the fact that our ancestors were dietary omnivores implies that vegetarianism is sub-optimal. Our evolutionary history is not by any means sure to provide us with optimal dietary behaviors or digestive processes.
Only if you make a few extra assumptions which may or may not be correct, and may or may not also apply to monogamy. (Or commit the naturalistic fallacy.)