Optavia Diet relies on intensely restricting the consumption of calories and carbs to promote weight loss. Most of the “fuelings” cover around 100–110 calories each, meaning one will take in around 1,000 calories per day on his diet. Due to the drastic measures of Optavia’s dramatic approach, U.S. News and World Report ranked it No 2 in the list of Best Fast Weight-Loss Diets. In the short term plan, it seems impossible not to shed at least some pounds, while you’re eating half the calories most adults consume but its long term plan is less promising.