It's probably both. It's true that countries where they don't put sugar in everything—or don't use HFCS at all—don't have this problem. It's also true that be

It's probably both. It's true that countries where they don't put sugar in everything—or don't use HFCS at all—don't have this problem. It's also true that between 1950 and 2000 portion sizes went up. For everything. If you travel in France and Italy, known for butter and pasta heavy cooking, respectively, their servings are half the size of the typical American restaurant. At the same time, if you go from a walking city in the US to a suburb where it's all cars all the time, the visible difference if you just look around at people is jarring. Sure, cities might eat differently, but not that differently. I'm not anti-car, but in some places the 100% sedentary lifestyle is a big part of the problem.