Medifast makes no claim that these results are representative of all participants on the Medifast Program. Medifast recommends you consult with a physician before starting a weight-loss program. Individual results will vary. Fullness Index is a satiety calculation based on a food.s fiber, protein, and calorie content. The equation is: (grams of protein per serving + grams of fiber per serving) x 100, divided by number of calories per serving. The higher the number, the more fullness is derived from each calorie. Medifast has been recommended by more than 20,000 doctors since 1980. BeSlim Club Membership: Minimum purchase of $150 required to qualify for free standard shipping offer. First orders over $250 receive 28 free meals. Second orders over $250 receive an additional 28 free meals. See the BeSlim Club terms and conditions for complete details.