Since 1980, the number of obese adult Americans has doubled. And the number of overweight adolescents has tripled. Psychiatrist Cindy Bulik (Virginia Commonwealth University/Medical College of Virginia) is researching the role genetics plays in who gains weight and who stays thin.

Also featured: Pediatrician Nancy McLaren (University of Virginia) tells us how obesity in children poses a major problem for the nation’s public health care system.

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