Greed, not laziness: The real cause of western obesity

Comparing data from the US from the 1970s and the early 2000s, it found that the diet of children contained 350 more calories, while adult diets rose by 500 calories.

If exercise levels had not changed at all, the weight of the average adult would have increased by an average of 24 pounds. In fact, the true figure was four pounds lower, suggesting exercise levels must have actually increased slightly over the period.