When planning your meals, remember that 1/3 cup of cooked beans is considered one starch diabetic exchange. One diabetic exchange of beans provides about 80 calories and about 15 grams of carbohydrates.
If using the beans as a replacement for animal protein, the serving size or diabetic exchange is 1/2 cup. For every half-cup of beans, make sure to account for one very lean protein exchange and one starch exchange.
The nutritional information for beans varies slightly from bean to bean.