If you like Reese's Peanut Butter Cups, this is for you. Too good to be true? Try it and see for yourself. PR*Nutritions unique 40/30/30 ratio of carbohydrates, proteins, and fats is the foundation for the PR*Bar and Nutrition Program. The PR*Bar and program are designed to maintain or increase lean body mass (LBM) and maximize your body's natural ability to burn stored body fat for energy.