1) they're overlooked because conditionally essential only means we can make a non-zero amount of them, but the amounts we might be adapted to expect could have relied on both exogenous and endogenous supply combined, and
Well, epidemiology is about more than relative risks. I think it's entirely uncontroversial to say that vegetarians tend to live longer, healthier lives than the average non-vegetarian. The causal mechanism is the question
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Really? Is this an outlier: https://www.ncbi.nlm.nih.gov/pubmed/26657045 But yes, I agree that even if such were found, it would like be confounded.
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Yep, the general trend is for vegetarians to be healthier. That being said, they're also usually wealthier, younger etc, so as you say likely confounding
End of conversation
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