This article isn't very convincing. Personally I recommend the books and videos by Dr. Jason Fung. (https://twitter.com/drjasonfung) If you are obese it is remarkably easy to become depressed and anxious. Especially if you aren't getting exercise because your energy level is so low.

The remarkable thing about Dr. Fung's lectures is he lays down the exact mechanisms which cause obesity. About how insulin resistance leads to reduced ability to utilize body fat. Then about why caloric restriction doesn't work due to the unavailability of fat and reduced metabolic activity. He isn't basing it off empirical work but a detailed study of the endocrine system.