> I just don't get the lack of skepticism.
Simple answer is people like to eat, lack discipline, and want to look good. None of these will ever change, and so the economic pressure is immense and unstoppable. Until it's proven that these drugs have serious side effects (and that's a real possibility), people will gamble on the risk/reward.
I wouldn't touch them yet myself, but I can see it's a fait accompli. As for solving the root cause, doctors and policy makers have tried everything, to little or no avail. And so we're back to those 3 variables that won't change.