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Study: Some foods help shed pounds, others help pack them on

A federally funded study conducted by the Harvard School of Public Health found these foods can affect your weight, for better and for worse.

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In a comprehensive study that collected data from more than 120,000 men and women, potatoes stood out as a food that had a particularly negative impact on one's waistline. Every additional daily serving pushed up the scale by more than a pound every four years.

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