A similar cautionary note that applies to nonwheat grains also applies to legumes (outside of peanuts). Kidney beans, black beans, Spanish beans, lima beans, and other starchy beans have healthy components in them such as protein and fiber, but the carbohydrate load can be excessive if consumed in large quantities. A 1-cup serving of beans typically contains 30 to 50 grams of carbohydrates, a quantity sufficient to substantially impact blood sugar in many people. For this reason, as with nonwheat grains, small servings (½ cup) are preferable.
