I think it's mainly that food is just more abundant. It's literally everywhere now. You can't go out and do something without passing easy to acquire, relativel

I think it's mainly that food is just more abundant. It's literally everywhere now. You can't go out and do something without passing easy to acquire, relatively cheap and high calorie food to tempt you, or to satisfy every passing snacking impulse. That just wasn't the case for most of human history, even most of the 20the century.