World faces 80% calorie increase by end of the century.

[Radu Almasanu]

it this a global increase in obesity or an obesity increase in developed countries

Yes, and we would need to find a way to help them stop eating food that's bad for them, we should start with children, we should stop showing them fast food but "real" food like the ones back in the day. Also start teaching them to cook food that isn't frozen like pizza or chicken wings, and to make this work they would be encouraged to eat some of that on rare occasions or once in two weeks or so.