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.
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./AP Images
A Harvard report quantifies what we feared all along: Eating more of certain foods will make us gain weight. An analysis of healthy American adults in their 30s, 40s and 50s in three Harvard studies reveals some surprises, too.