The study, which York University published in the Journal Obesity Research & Clinical Practice, found that an American adult in 2006 had a higher body mass index (BMI) than an adult in 1988, even when they had the same diet and activity levels,

More specifically, when the study compared people with the same diets in 1971 and 2008, it found that the more recent subject was 10% heavier on average. When comparing physical activity data between 1988 and 2006, the 2006 subject tended to be five percent heavier.

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