Most people aren't fat because they're lazy. Most people are fat because they eat too much. We have a culture that glorifies food, junkfood more than the rest. Overeating when eating junkfood is absurdly easy. Teaching people how to eat healthier and eat less is the best known way to help people lose weight.

Constantly talking about genetic predispositions, obscure metabolism suppressing viruses or gut flora does about jack shit to help people lose weight.

The minor difference between the weekly calorie expenditure of the average person and the morbidly obese is mostly meaningless. It’s much more about how much they eat.