Naturally and artificially flavored. Controls hunger up to 4 hours. 220 Calories. Meal on-the-go bars. 8 g protein. 2 g fiber. At Slim Fast, we believe that everyone has a right to their right body. With Slim-Fast, you can find the weight and size that is right for you. Slim-Fast products help control calories and your hunger, and the Slim-Fast Plan provides balanced nutrition which lets you enjoy a variety of foods, so it's easier to stay motivated, lose weight and find your slim! Slim fast bars gave me the energy and results I am so very proud of - Lonie K, San Bernardino, CA. Did you know? Slim-Fast is a proven approach to weight loss, with over 35 published clinical studies designed & conducted by independent researchers. One Slim-Fast Optima Meal Bar provides the balanced nutrition of a meal, including a good source of protein, antioxidant vitamins C & E, and 30% of the daily value for calcium.