Foods are ranked according to how fast they raise blood sugar and keep it elevated, using a system called the glycemic index (G.I.). In the world of G.I., lower is better. Slowly digested carb-containing foods like lentils and whole-grain pasta have low G.I. rankings because they cause blood sugar to rise slowly. White potatoes, candy, table sugar, and even some fruits (like pineapple) are at the high end of the G.I. scale, so you should avoid them. Simply put, this is a high-fiber, low-G.I.-food diet. Interestingly, the breakdown of nutrients in the original Sugar Busters! is similar to those of many other low-carb plans: 40 percent carbs, 30 percent protein, and 30 percent fat. The New Sugar Busters! mentions that you can increase carbs to 50 percent as long as the choices are low-G.I. foods.