Diet therapy before and after chemotherapy for gastrointestinal tumors Patients with gastrointestinal tumors have different degrees of malignant ulcers, pain, poor nutrition, weakness, anemia, tarry stools and other symptoms. Before and after chemotherapy, in order to avoid aggravation of the disease and the above symptoms, attention should be paid to diet regulation, avoiding acid, sweet, cold, hard, spicy and fried foods, and in chemotherapy, a light diet should be the main focus, easy to digest and absorb, no stimulation, plus the mood should be relaxed, stay optimistic, and ward ventilation! Easy through the chemotherapy period.