That doesn't explain it though, as how much you weight and how happy you are with it should influence how you eat.

Obviously a kid and an adult, a sedentary female and an international athletes have different needs.

When you have tooth problems, you go through a lot to have it fixed. When your hair looks bad you get a haircut.

Some obese people change their lifestyle and lose that weight. So what about those who can't? Is it too hard because of whatever predisposition (or, as other comments point out, having a huge industry putting tasty things in front of them), or do they just feel better being big?