The Diabetes Food Pyramid divides food into six groups. The largest group—grains, beans, and starchy vegetables—is on the bottom. This means you should eat more servings of grains, beans, and starchy vegetables than any of the other foods. [Choose the good carbs; the ones with a low glycemic index.] The smallest group—fats, sweets, and alcohol—is at the top of the pyramid. This tells you to eat very few servings from these food groups. Source: www.diabetes.org .
For a more comprehensive breakdown of the foods, and the quantities you should eat, you might want to read this article about the Diabetes Food Pyramid .
Although the USDA recommends that the majority of your daily intake should be made up of carbohydrates, studies show that a high nutrient content per calorie ratio equates to optimum health.
Picture white sugar, for instance; it is very high in calories with low nutrient content. So, it would lead to poor health; however, if we look at the Nutrient-Density Line found in Eat to Live by Dr. Fuhrman, we see that raw leafy green vegetables are the most nutrionally dense food we can eat.