Medifast is clinically proven. Developed by a physician, it's the brand recommended by more than 20,000 doctors since 1980. You lose weight quickly while learning how to eat healthier. Medifast Meals are formulated with low-fat protein and fiber, and fortified with vitamins and nutrients, so you lose pounds and inches without losing out on essential nutrition. The low-glycemic index formula of Medifast Meals makes them perfect for everyone, even people with type 2 diabetes.