The digestive system processes food in the human body by breaking down nutrients and absorbing taste materials. It includes the mouth, esophagus, stomach, small and large intestines. Food is delivered to the stomach through the esophagus after it's chewed by the teeth in the mouth. In the stomach, it's broken down in an acidic environment. Enzymes act on the main taste materials in the small intestine. Finally, water is absorbed in the large intestine and waste is excreted. Digestion typically takes 24-72 hours. The stomach can hold 1-3 liters and the small intestine is approximately 6 meters long