According to new study the problem of obesity is a problem of all social classies. Previously considered mainly the problem of the poor people, it's now clear that also Americans earning more than 60k/year are having the same problem.

When previously mainly cheap fast-food was blamed for people's overweight, then now it's not the case anymore. It's rather lack of excercise, too much sitting in one place and too much non-physical work.

During the last 3 decades the obesity among Americans have doubled and the change has been biggest among the richer people.