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A study argues that the density of restaurants and large-scale food retailers in parts of the U.S. has been a major factor in the rise of obesity. But some see it as a "chicken and egg" problem.
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Food and beverage companies made a pledge to cut back on the calories in their products.
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Liz Paul has struggled with her weight for years. A diet group helps, but it only meets once a week. So she has turned to social media for daily feedback and support. Studies find it can help.
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Major food companies have cut trillions of calories, and studies show Americans are consuming fewer calories because of it. But some advocates think companies should do more to improve our diets.