Diets often restrict people’s favorite foods and make it difficult for them to maintain. One diet that breaks that mold is Volumetrics, the No. 2 weight-loss plan in this year’s U.S. News & World Report's "Best Diets." On this episode of allinfoodz, Dr. Amit Sharma discusses the diet plan with the developer, Penn State Professor of Nutrition Dr. Barbara Rolls. Dr. Rolls shares how Volumetrics focuses on thinking positively about what you can eat rather than restricting.