Well, overeating is maybe simplified too much but it can be reduced mostly to "wrong eating". Perhaps not overeating in absolute volume but overeating of effetc

Well, overeating is maybe simplified too much but it can be reduced mostly to "wrong eating". Perhaps not overeating in absolute volume but overeating of effetcive calories. There might be metabolic difference between people leading to different eating patterns working for different people, sure. But if you are obese in virtually all cases it is simply a matter of changing your diet (even for the cases that have an independent medical cause such as a thyroid disease). And in most cases the fix is to simply eat less callories in general by eating less and/or healthier alternatives. And exercise does help you lose body fat, unless you start eating extra to compensate for the exercise as most people vastly overestimate how much calories you actually burn working out. And of course power-training that helps you build muscle mass can increase your weight but that does not mean that it is bad for you. If you're going to the gym regularlly anyway during your diet just measure your body-composition to track your effective weight. (not sure how accurate that is though).