The general principle of diet for postoperative patients with gastric cancer is to have small amount of meals and gradual progress. The diet should be light and rich in high vitamin and protein, and easy to digest. Patients can eat eggs, dairy products, lean meat, tofu, soy milk, fresh vegetables and ripe fruits. Meanwhile, patients should chew and swallow slowly when eating, and use their tongues to stir more often with saliva, so that the oral cavity can replace part of the digestive function in the stomach, which is quite important in the early postoperative dietary recovery of gastric cancer. In addition, the absorption of iron is affected by the reduction of gastric acid after surgery, so some iron supplements can avoid iron deficiency anemia. For patients after total gastrectomy, it is better to take intravenous supplementation of folic acid, vitamin B12 and other trace elements once a year. In addition, patients should avoid eating stimulating foods such as too cold and too hot, raw and hard, fried, strong tea and wine after surgery. Some patients with gastric cancer develop dumping syndrome early after surgery. The pathogenesis is that food can enter the small intestine quickly because the pyloric sphincter is removed during surgery. If the food contains high sugar content or high osmotic pressure, a large amount of extracellular fluid can be inhaled into the intestinal lumen in a short time after entering the small intestine, which reduces the blood volume. At the same time, because the food enters the small intestine quickly, the intestinal cavity is forced to swell suddenly, and intestinal peristalsis increases, stimulating the abdominal nerve plexus. Under the superposition of the above factors, the patient mainly shows symptoms such as dizziness, pallor, vertigo, palpitation, sweating, nausea, vomiting, or abdominal pain, abdominal distension, diarrhea, etc. half an hour after eating. At this time, the patient should be immediately put in bed to relieve symptoms, and intravenous isotonic solution can be supplemented to maintain blood volume if possible. For dumping syndrome, the current treatment method is mostly preventive. That is, the patient is instructed to eat small amounts and drink as little water as possible when eating. This is because liquids can quickly dissolve food and form a hypertonic solution to the small intestine, triggering or aggravating dumping syndrome. In addition, patients can lie flat for 20-30 minutes after eating depending on their specific situation can control or reduce symptoms.