This needs to be said

There is a LOT of over generalization about obesity in America, but this need not have been said:

Do you think Americans are lazy?

Without a doubt. We're the victims of our own successes and prosperity, which have caused us to change our lifestyles from being people who had to hunt for our food to people who have more than we can possibly consume.

Look, Americans are HARDLY lazy, look at our goddamned work hours; look at our other activities. For many Americans the only damned release from the pressure and agony of long-work days, a reward is the triple heart-attack burger with the texas-bbq-chipolte-guacamole sauce and the super-duper-biggy fries -- but just a Diet Pepsi with that. It is not about American's being lazy, it is about a society so work-driven, so pressure filled, that that stuffing our faces is one of our few release mechanisms.

We work longer hours and have less free time than anyone else in the free world, and more pressure than others -- yet we seem destined to view prosperity in terms of the ability to stuff our faces with the Texas Rib Crossanwhich.

...And as Pro-Choice Lib says in comments, the cheapest foods are often the worst for you, which explains how the poorer you are, the worst shape you often are.