Over the last twenty years,the Americans' calorie intake has increased.This is due in part to

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Studies have shown that the availability of larger portion sizes has contributed to the increase in calorie intake among Americans. The trend of super-sizing meals at fast-food restaurants and the increasing size of packaged foods in grocery stores are some of the factors that have led to larger portions and subsequently higher calorie intake. While consumption of fats has also increased, it is not the sole contributor to the increase in calorie intake. The impact of genetically modified foods on calorie intake is still not clear and there is no evidence to suggest that increased consumption of organic food has led to higher calorie intake.

Over the Last Twenty Years,the Americans' Calorie Intake Has Increased