The obesity epidemic in the US is due solely to increased food intake

Melbourne, Australia - The amount of food Americans eat has been increasing since the 1970s, and that alone is the cause of the obesity epidemic in the US today [1]. Physical activity—or the lack thereof—has played virtually no role in the rising number of expanding American waistlines, according to research presented at the 2009 European Congress on Obesity in Amsterdam last week.

http://www.theheart.org/article/970183.do