In my experience, the viewpoint of the rest of the world toward America is that we are all fat. While obesity is certainly a growing problem, unfortunately even among children, not everyone in America is fat. Much like stereotypes of other countries, America is not actually all obese people and streets paved with gold. While there is (or I guess, was) a good bit of opportunity here for success, unfortunately the real porkers are the ones who often get in the news, and not so much those who regularly stay fit and healthy.
Personally, I hate this image of being the "fat stupid American". There are things done that I personally feel are questionable within the government's foreign policy. And I feel like "we" as a country stick our nose into too many things. But those things aren't really up to me personally. If we're talking personally, I'm an exercise addict, I love cycling and mountain biking and running etc. etc.
And thus I stand by the point that this ideology of the fat American is but a fable. A fable of fat, if you will. But hey, that's just me.
America, pull your shit together. Let's become a healthy fit American!