Everyone knows that people put on weight because they consume more calories than they burn. But as the medical community struggles to get a handle on obesity in the USA, a growing body of research is delving deeper to find out more about the psychology behind the numbers.
Although people might be inclined to think of nutritionists or dietitians, obesity is "one of the big common public health issues that falls right in the heart of psychology," says psychologist Paul Rozin of the University of Pennsylvania in Philadelphia.
Among a host of questions aimed directly at the psychology of eating are why Americans are eating more than they used to; whether some foods can really be addictive; and whether more people than in the past are genetically predisposed to pack on pounds.
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