A total gastrectomy leaves a small portion of the stomach to aid in digestion and the small intestine to help digest food. Total gastrectomy is a treatment for severe stomach ulcers, stomach cancer, and other diseases. The operation does not remove the entire stomach, but leaves a small portion of the stomach. After the food enters the stomach, the remaining intestines digest the food initially, and after digestion, it enters the duodenum and the small intestine. The absorption and digestion of the duodenum and small intestine are normal, and they can provide the nutrients needed by the body. The stomach is contractile, and it will increase in size with the increase in diet after the surgery, but the room for enlargement is limited. You should pay attention to your diet after total gastrectomy, avoiding foods that are difficult to digest and focusing on foods that are easy to digest, which can reduce the burden on your stomach.