This Fasting Mimicking Diet 5-Day Meal Program is based on two decades of scientific discoveries. Everything you need for each of the 5 days is located in one convenient carton, individually packed and labeled for each day. The meal program consists of scientifically formulated, great tasting, plant-based foods that are either ready to eat or easy to prepare, including soups, bars, snacks, supplements, a drink concentrate, and teas. Day 1 provides about 1159 calories and 800 calories days 2-5. ProLon has been shown to provide protective, regenerative and rejuvenating effects, while providing balanced nourishment.