The burden of proof to demonstrate efficacy of biomedical tools (namely, drugs or surgery) is on biomedical scientists and physician-investigators. We are too quick, as a society, to assume their science is particularly good, just because it's popular, they're confident in what they do, and what they do appears impressive. Eminence is trumped by evidence every time, and some things that were hitherto dearly held beliefs by medical scientists as true have been crumbling down around them over the last fifteen years. Some biomedical findings are true and stand the test of time. Most don't.