Hmm, that would be interesting, except it seems they only considered 14 studies. They find in 11 of these observational studies match the results of RCTs. Im s

Hmm, that would be interesting, except it seems they only considered 14 studies. They find in 11 of these observational studies match the results of RCTs. Im sure this will be different in areas where there is no public awareness of a risk factor vs ones where there are. Eg healthy diets select for people who care about their health, so it's not so infomative, vs something where the link is not publicly known (so that the observational study is already somewhat blind/randomized).