So what we typically see with dieting is that people make behavior changes. After those changes are made, those folks often see health improvements, and sometimes see a small amount of weight loss (at least in the short-term.) Even though the weight loss is small, and often largely simultaneous with the health improvements, the weight loss gets credited with the health changes, rather than seeing both the health changes and the (at least short-term) small amount of weight loss as resulting from the behavior changes.

Giving the credit to weight loss, rather than the initial behavior change, drives a lot of profit to the weight loss industry, but drives a lot of harm to fat patients.