So many cultures have used black beans as a staple in their diet for good reasons!! Dried black beans: last for years, store easily, are very inexpensive, packed with fiber and protein, and are incredibly nutritious!! A 1/2 cup of cooked black beans cost less than .$50 per serving, has 114 calories, 8 grams of protein, 0 grams of sugar, and 20 grams of carbs