The Optavia program offers different variations of meal plans that all consist of purchased "fuelings" and "lean and green" meals. Your fuelings are things like shakes, bars, cookies, cereal, smashed potatoes, and soup, while your lean and green meals include protein like fish, chicken, egg whites, turkey, or soy, plus vegetables like lettuce, greens, celery, or cucumbers (via Good Housekeeping). 

While Optavia is considered a high-protein program, participants only average about 800 to 1,000 calories a day, and it is also a very processed and packaged diet (via Prevention). U.S. News reports that alcohol, butter, coconut oil, shortening, chocolate, high-calorie desserts, and sugary drinks are the only restrictions on the Optavia diet. Otherwise, calories and carbs are not counted.