If you want to reach a certain aesthetic then that's fine, but as far as I know the "obesity problem" is more about a persons health and well being, not being aesthetically pleasing.
So we can sit here and point fingers at what diet is best or whether or not we should cut fats out of our diet, but at the end of the day the true issue is simply people do not have the will to exercise, and they either do not have funds or the will to eat a healthy amount of calories.