So, it seems to me that if the epidemiology is weak and conflicting, there may be factors that aren't measured that are coming into play, such as supplementation, or other things that education might be a proxy for.
I'm sure most vegetarians would argue that everyone knows that you have to supplement certain nutrients by eating specific foods, most people don't just go bread-only
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This would be good to get real quantitative information on, actually, though I'm not sure how. What do vegetarians think they need and what do they actually do? It might be different from your or my intuition.
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I'm sure there's been qualitative research on the subject, although not my area of expertise
End of conversation
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