The absorption of nutrients in the stomach is mainly through the intestines, and some inorganic salts, glucose and proteins can be absorbed through the stomach. Food will be mechanically and chemically digested in the gastrointestinal tract and broken down into small molecules of nutrients that can be absorbed by the body. The stomach mainly plays the role of digestion. The peristaltic movement of the stomach wall plays a role in mechanical digestion. Gastric acid and protease inside the stomach can play a chemical digestion. For some inorganic salts, glucose and protein can be absorbed through the stomach. The intestines mainly play a role in absorption. The intestine is the longest section of the digestive organs and is the main place for digestion and absorption. For most of the inorganic salts, glucose, protein and fat can be absorbed through the intestine. Enteral nutrition can be considered for those who should not eat due to stomach problems. Digestion and absorption can be improved by placing a jejunal nutrition tube. For nutritional supply, it is recommended to consult the doctor to choose the specific way in the light of the condition of the patient.