The chicken/egg problem is satiety, not weight. Being fat messes up many small feedback loops, some of which are related to satiety, energy expended, exercise,

The chicken/egg problem is satiety, not weight. Being fat messes up many small feedback loops, some of which are related to satiety, energy expended, exercise, inflammation or mood. Breaking those circles is not easy at all. It's closer to rehabilitation and a long process. Of course reducing intake is a main goal, but then keeping it low is as important.