I lost 50lb with no exercise. But if I had listened to any doctors at all, I would never have succeeded. Most people listen to doctors. Their trust is misplaced, but I don't think that makes them crazy.
Another similar major CW fail is bulimia camp. They take these poor girls who have physical urges for "more sugar!" (purging is just a natural response to get rid of the binge; the BINGE is the problem) every minute of the day, and FORCE them to eat a certain amount of food each meal, with great classics like pancakes and syrup ... then force them to go the next X hours without eating till the next carb-heavy, protein-and-fat deficient meal, tormenting them further.
Exercise & starve tactics are pointless. Fix the broken cravings with a solid diet and they become totally unnecessary because your body starts to regulate food intake & movement naturally, the way it was always supposed to.