Yes it is a problem that many Americans are fat. Fat is unsightly and bad for health. But if we went back in time to any other country in any other time and said, "Our biggest health problem is that our poor people eat too much and get fat." They'd laugh at us.
Our biggest health problem is not that our poor starve, or cannot find certain foods. We've had no potato famine. Our problem is that food is too cheap and too available (compared to anywhere else at any other time).
Its really quite an amazing accomplishment. Sometimes we forget how truly wealthy we are compared to the rest of world history.
That being said, the obese are still gross.