Fast Food: A federal judge has news for America - McDonald's () didn't make you fat. And new research suggests that obesity is home-grown.Why are Americans too fat? (By all accounts, on average they are.) The answer is painfully obvious: They eat too much. And overeating is a matter of choice. It can't be blamed on McDonald's, agribusiness or even the government.That's pretty much what U.S. District Judge Robert Sweet was saying this week when he dismissed a lawsuit charging McDonald's with causing the obesity and other health problems of two teen-age girls in New York City. The suit was...