I'm old enough to remember when back in the 60's it was standard medical practice to prescribe amphetamines for weight loss. There was certainly a lot of bad side-effects from that practice including drug addition.
This was also the very same time where the same professionals considered sugar to be just as good as any other food. "A calorie is a calorie". Turns out a sugar company lobby funded a Harvard study which pitched the idea of sugar is good and fat is bad. The study was little more than a combination of a bribe and PR wrapped up in an illusion of scientific study, but it became medical gospel for decades.
The amount of horrid dietary voodoo advice given, unnecessary operations performed, dangerous drug prescriptions written, and bungled diagnoses are legion.
The value paid for service rendered is one of the absolute worst.