You do not understand what happens to hunger regulation.
The human body fundamentally don't have a concept of too much fat. It only really has a concept of "close to the highest fat mass we've had" or "below highest". It keeps recalibrating for your new highest and will make you want to eat more until you get back there. That's it's mechanism to drive you to avoid starvation, because it doesn't know what "overweight" is.
Any long term treatment needs to focus on that regulation mechanism and recalibrate it down. We don't know how to do that yet, all we can do is silence the hunger or change absorption.