Raw bananas are green bananas that have not yet ripened. They are a curved fruit with a uniformly tough, green skin. The dense, firm, white flesh has a starchy-tart flavor, as the sugars have not yet developed. Raw bananas are best cooked, and will taste very similar to potatoes.
Raw bananas contain resistant starch, which passes through the body undigested. Resistant starch keeps the digestive system healthy, as it promotes the growth of probiotic bacteria in the digestive tract, and it may keep you satiated longer. In addition to starch, raw bananas contain potassium and Vitamins A, C, and B6.