[Steltek]

There are a lot of roadblocks put in the way to controlling your weight. In the US that on the intake, junk food is readily available while healthy food is a luxury. Conversely, the US working environment suffers from increasingly medieval labor laws[+], limiting one's ability to exercise or live a well balanced lifestyle.

I wouldn't be so eager to say "being obese is dictated by one's actions". It's an equal mix of self-control and an unhealthy environment.

[+]: "Independent contractors", arbitration, union stigma/busting

[Andre_Wanglin]

I dispute that avoiding obesity requires either exercise or high-quality nutrition. It is simply a matter of maintaining a caloric balance at a healthy weight. This can be effectively controlled entirely on the intake side. (See the nutritionist who lost weight and improved his bloodwork on a gas station junk food diet. [0]) Other countries with varied labor and economic conditions (presumably among them are some you would not label medieval) are experiencing the same obesity pandemic. There is nothing unique about the US in this regard other than it has been leading the trend.

[0]: http://www.cnn.com/2010/HEALTH/11/08/twinkie.diet.professor/