Dietary precautions for gastrointestinal adenocarcinoma include eating a light diet that is easy to digest and absorb, suggesting more nutritious food, paying attention to eating less and more meals, avoiding spicy and stimulating food, and eating less high-fat and low-fiber food, etc. After surgery, patients with gastrointestinal adenocarcinoma should have a light diet that is easy to digest and absorb. 1. Diet should be light and easy to digest and absorb so as not to increase the burden of patients with gastrointestinal adenocarcinoma. 2. Eat more foods rich in protein, fiber and minerals to ensure the nutritional needs of patients with gastrointestinal adenocarcinoma. 3. After surgery, patients with gastrointestinal adenocarcinoma should pay attention to eating less and more meals, which is conducive to the recovery of gastrointestinal function. 4. Avoid eating spicy and stimulating food to prevent damage to gastrointestinal mucous membrane, which is unfavorable to patients’ health. 5. Since high-fat and low-fiber diet is the cause of high incidence of intestinal cancer, patients with adenocarcinoma of gastrointestinal tract should avoid this kind of diet to prevent recurrence of the disease.