It's all the damn GMO refined wheat and other "fillers" in our so-called "foods". Plus, sugar on top of sugar and all this artificial crap to make non-food taste and look like food.
Look at pics of people up to the 70's; mostly slim to moderate chubbiness, seeing grossly overweight folks was rare. Now look at a crowd of people today. Fat, fat, and fat. Everyone is getting thicker because of all the bread and sugar we consume, compounded by sedation, apathy, and a daily handful of pills just to function and get through the goddamned day.