Best and Worst Foods for Diets —-http://fitbie.msn.com/slideshow/best-and-worst-foods-diets —After following about 121,000 men and women for 20 years, researchers at Harvard University published a study in the New England Journal of Medicine in 2011 that documented the foods and drinks most and least associated with gaining weight. Nutrition Energy’s Lauren Antonucci gives the benefits or drawbacks of each.