Description. Performance Nutrition for all Ages Active Lifestyles High Protein GMO Free Muscle Mac™ pasta combined with great tasting Real Cheese for a. Combined, our high protein pasta and Real Cheese create a healthy and satisfying meal for all ages. In fact, just one serving of Muscle Mac® provides 42 % of. Enjoy one of America's most popular meals and feel good about it. Thanks to Muscle Mac, Macaroni & Cheese is now healthy for you. One serving of Muscle.