The US is only the 9th fattest country in the world. But it's based on BMI, and BMI is bullshit (see Penn & Peller's Bullshit!, Season 5, episode 1 for more info on BMI). Not to mention that hoarding calories is what the human body is designed to do. Not to mention that being overweight or obese doesn't necessarily mean you are not healthy. For some people, because of genetics and such, being overweight is a healthy state for them, often more healthy for them in particular than if they were not overweight. As long as you exercise, you can be healthy without being your ideal body weight. Often, people who are overweight/obese that exercise (walking, jogging, working out, etc) are healthier than the skinny guy who doesn't exercise.