Why are we fat?

To lose weight you need to increase activity and decrease calories. Theoretical equations sound so easy, don't they? But if losing weight really were this simple, why does the collective girth of the United States continue to grow? According to a Harris phone survey from March 1998, a whopping 76 percent of adults older than age 25 were found to be heavier than the recommended weight for their height and body frame. The percentage of the population in the "obese" category (weighing 20 percent or more above recommended weight) was 28 percent. However, the National Institutes of Health puts the rate of overweight adults at 55 percent.

What's behind this growth?

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