The high content of pectin promotes good digestion and is thought to lower serum cholesterol. Apples provide a great source of dietary fiber and have 15% of the recommended daily allowance of vitamin C as well as a high content of vitamins and minerals. Its fruit sugar provides quick energy. The large water content, about 85%, is a natural thirst quencher. The acid in apples is a natural mouth freshener, and apples help clean the teeth.