> If you have any double blind study with more than a hundred subjects taken randomly from the general population (including "healthy" subjects), with a control group, spanning more than 3 years of observations I'd be dying to read it
I see a multitude of cases where jumping out of the plane without parachute won't kill me. From the plane being on the ground, to me being equipped with anything other than a parachute that lets me fly enough, jumping from a plane to another etc.
And I'm not just being facetious, that's exactly the issue we have with pathology related diets, there's a myriad of variables and circumstances to take into account, which makes vague common sense dogmas innaplicable.
Think about it: we have very thorough studies of people dying from hitting static surfaces at high velocity. Why don't we have the same level of evidence for long term obesity treatment if it's a obvious as you say it is ?