'Fed Up' asks, are all calories equal?

Americans have long been told that the cure for obesity is simple: Eat fewer calories and exercise more. But a new documentary challenges that notion, making the case that Americans have been misled by the idea that we get fat simply because we consume more calories than we expend. David Ludwig, professor of pediatrics at Boston Children's Hospital, and Dariush Mozaffarian, associate professor of medicine at Brigham and Women's Hospital, are quoted.

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