I try to be nice to everyone as none of us are perfect and fat is just a more easy to see imperfection, right?
But as far as it being mostly lifestyle choice, I agree. I am older. When I was in school there was ONE fat girl, Tanya, and a few “husky” boys. The rest of us were thin.
Do I think Tanya chose to be fat? No way. I think she had some medical issue that made her body hold on to all that fat. But I think the natural incidence of that sort of issue cannot have increased, in one or two generations, from that 1/400 to 1/3. It’s not possible.