Nutrisystem is a diet plan service with a variety of pre-packaged, ready-to-eat food, delivered at your door. Nutrisystem Review, Nutrisystem is a diet delivery program that includes both fresh-frozen foods as well as their traditional reheat meals. Nutrisystem Bogo provides several programs for different types of customers and varying budgets. There are separate programs for men and women, as well as specific plans for vegetarians, and people who have type 2 diabetes.