I have the opposite history: I was able to stop stressing out about my weight when I realized that, no, I really don't prefer the idea of a thin life devoid of cheesecake and fried things to the life I currently have where I eat whatever I want and am yea big. (This calculation may change if I become more than yea big with age.) Making this tradeoff explicit in my head actually helped me uncover a couple of weird self-denial habits that did not make any sense according to any metric (specifically, I was not having all the legumes and fruit I wanted, out of some confused subconscious notion that they were displacing vegetables... but meanwhile I had already abandoned the difficult project of limiting my chocolate intake.)