Pre-operative chemotherapy for rectal cancer can increase the success rate of surgery: to reduce the recurrence of metastasis after surgery, the diet during chemotherapy should be light, easy to digest and highly nutritious. In order to reduce constipation symptoms in chemotherapy, more vitamin-rich vegetables, fruits and some other foods that help to fight cancer should be eaten, such as asparagus, kelp, seaweed, onion, garlic, mushroom, etc. Patients often have the reaction of decreasing white blood cells, at this time, they should eat mushrooms, eels, snappers, pig liver, big bone soup, lean meat, dates, walnuts, cinnamon meat (not raw, must eat processed ones). Recommended spleen and appetite soup: for weak spleen and stomach, do not think about eating, reduced food consumption; or stomach gas rebellion, nausea and vomiting, or even vomiting frequently. It is especially suitable for those who have little food and are sluggish during illness, because it is also equipped with a high concentration of highly nutritious duck soup essence, which has a very good tonic effect.