I'll bite: yes.

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 ?