This is my biggest issue with weight healthcare, the idea that if only the patient would eat correctly they wouldn’t be overweight. It’s not some moral failing a person often over eats, it very well could be some physiological issue that should be treated. It would be like telling someone with asthma that they just need to get into better shape to breathe better.
On the asthma front, from experiences with someone close to me -- getting in great physical shape (with caveats regarding training) DID indeed help greatly with broncho-constriction and higher scores on FEV. Basically symptoms and inhaler use went down tremendously over a few years and a physical transformation.