The digestive tract is a tube over 25 to 30 feet long, consisting of the mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus. The teeth, the churning motion of the stomach and the acid, enzymes and other chemicals produced by various digestive glands break down the food into minute pieces, namely proteins, carbohydrates, fats, vitamins, minerals, fiber and water, all of which are needed to function normally. These nutrients are absorbed either by the blood or lymph and transported throughout the body. They are converted into immediate energy used by cells, saved energy stored within cells, or building blocks for cell growth and repair. The fate of such nutrients depends partly on the form in which they entered the body, and on the body's particular needs at any given time. Those substances that are not digestible, continue through the digestive tract as waste and are prepared for a proper exit through the anus.
You eat about half a ton of food every year.
The digestive tract is more than 25 feet long.