This is portion control made easy. To lose weight you need to watch what you eat and control your portion sizes. The 21-Day Fix takes the guesswork out of how many carbs, proteins, veggies and fruits, and fats you need daily. With this user-friendly system, you can eat your favorite, healthy meals, without counting calories or missing out on flavor. Keep in mind, the best approach to weight loss is to incorporate a daily fitness routine along with your healthy eating habits, which is also included in the kit.