If you're truly interested, it is not hard to find research studies, books, real life examples, etc. on the subject.
However, as with anything to do with the study of health, there is no "proof" of anything out there. Everything is a "maybe". We can't even agree if meat is good or bad for you, if cigarettes cause cancer, if alcohol in small quantities is good or bad for you, etc. Everything just gets twisted.
I've even heard of studies that claim that drinking water is not good for you.
Science is a weird thing. On one hand it's useful, but on the other hand it can't really prove anything.
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