Thats similar to what the book presents. The head of the Eating Lab at the U of M, Dr. Traci Mann, began her career in psychology. There are many physiological and psychological factors involved.
When I struggled with weight (high school and college years) I was trying so hard to be thinner, but dieting backfires. Not just for me but for almost everyone. I wasnt super obese, just heavier than I should have been. Diet companies count on repeat customers to make a profit. My mental health was probably a wreck as well.
My take away from the book was veggies first, move more and not everyones natural size is skinny. I have to be careful with my child who struggles. A part of my problem was my dad constantly hinting that I needed to lose weight. I would eat more just to spite him (hindsight reveals much).