Apples are extremely rich in important antioxidants, flavonoids, and dietary fiber. The soft inside part of apples provides soluble fiber, while the tough outer skin is insoluble fiber. Soluble fiber binds with water and slows digestion. Insoluble fiber stays intact and pushes out waste, making your stools soft and keeping you regular. Apples are rich in carbohydrates and Minerals such as calcium, potassium, and phosphorus.