The digestion process of food is mainly through the oral cavity to give the initial chewing and mixing, then into the stomach, under the action of gastric acid and gastrointestinal peristalsis to give the initial dissolution, the large particles into small particles, and then discharged into the duodenum into the small intestine. The small intestine is the main place to absorb nutrients, first absorbing water and electrolytes, followed by protein and fat, and finally converted into amino acids, and then discharged into the jejunum and large intestine. The jejunum and large intestine mainly absorb a large amount of water and a small amount of amino acids, as well as electrolytes and water, and finally pass through the cecum, as well as the ascending colon and sigmoid colon, and are discharged from the body. The digestion process varies depending on the type of food.