Patients with advanced rectal cancer can eat foods that are nutritious, easy to digest and absorb, rich in vitamins and fiber, but they should avoid spicy and stimulating foods, such as rice, noodles, steamed buns, fresh vegetables and fruits, and so on. You can also eat more soups, such as fish soup, rib soup and chicken soup, which can increase nutrition and replenish water. Patients with advanced rectal cancer may have abdominal pain, poor bowel movement, thinning stools, unformed stools, etc. Incomplete intestinal obstruction may occur, and patients may have paroxysmal pain in the abdomen, so they should eat foods that are easy to digest and absorb as much as possible.