Why are Americans so incredibly fat?

Not everyone is fat for starters. As for why so much of the western population is fat(I moved from America to Canada and can safely say there's alot of fat people up here as well) is our diet. In France you are more likely to take the time to prepare meals, while western culture is mainly invested in "meals on the go". Wine and cigarettes in moderation as well have had studies proving the benefits to weight(though your lungs and livers may not be the healthiest in the end).