First of all, the cause of the reduced eating should be figured out, before or after treatment? If the decrease in eating occurs before tumor treatment, it usually requires clinician’s intervention and treatment. What we are going to elaborate here is how to increase nutrition for the reduced eating in the course of tumor treatment, which is also the urgent concern of the clinical tumor patients and their families. 1.Decrease in food intake of tumor patients in the process of chemotherapy. Nausea and vomiting are the most common side effects of chemotherapy, and also the main cause of reduced eating. Nausea and vomiting usually occur a few hours after chemotherapy and do not last long. Severe nausea and vomiting that lasts for several days is relatively uncommon. Along with the application of antiemetics by the clinician, changes in diet can reduce both symptoms. First, don’t eat too much at one time, eat as slowly as possible, and chew your food slowly to aid digestion. This way your stomach won’t feel too full, eat small meals, don’t drink during meals, and don’t eat sweet, fried or fatty foods. Eat cold or at room temperature to reduce the irritation caused by the smell of food. If you feel nauseous in the morning, then eat dry foods such as cereal, toast or crackers before you get up (don’t eat these if you have a sore mouth and throat or dry mouth), drink beverages that are cold and clean, such as apple juice, watermelon juice, tea, etc. Suck on ice, mints or sour candies as appropriate to enhance the taste and improve the smell of the mouth, while avoiding exposure to odors that make you sick, such as oil smoke, cigarettes and perfume. Rest in a chair after a meal, and do not lie down until at least two hours after the meal. Wear loose clothing and take slow, deep breaths to relax yourself. You can distract yourself by talking with friends or family, listening to music, watching movies or TV. If you often feel nauseous during chemotherapy, do not eat for at least a few hours before chemotherapy. About half of chemotherapy patients feel emotionally unstable before chemotherapy, which is called pre-treatment nausea. The best way to deal with pre-treatment nausea is to choose an appropriate way to relax yourself. 2, tumor patients in the process of radiation therapy appeared to eat less. The common systemic reactions during radiotherapy include nausea and vomiting, loss of appetite, fatigue, etc., which are generally not very serious, mostly due to gastrointestinal dysfunction after radiotherapy, but also due to the irradiation of the brainstem or radiotherapy field is too large, plus the patient’s mental tension, anxiety, pain, etc. will aggravate these reactions. The diet should be good in color, aroma and taste, well cooked, varied, easy to digest, no special odor, few meals, do not eat too sweet, spicy and greasy and improper smelling food, eat salty snacks and food, you can take some stomachic drugs, such as vitamin B6, gastric complex or morpholine, pepsin, etc., to promote gastrointestinal motility and digestion. Do some exercises after meals. If the reaction is very severe, consider suggesting to the doctor to temporarily suspend radiotherapy. Pressing or needling the Neiguan point and the Foot San Li point with your hands may also help. Pain in the oral cavity and throat is the most common side effect of radiotherapy for head and neck tumor patients, which often starts to occur around 2 weeks after radiotherapy. Patients show dry throat, sore throat and difficulty in swallowing. To alleviate the reaction, drink more water, keep the mouth moist, and rinse the mouth with oral Tai or Dobell’s liquid, and take Shuahe 25 mg orally. If there is serious mucosal reaction, such as oral ulcer, erosion, affecting eating, radiotherapy can be suspended, and oropharyngeal spray is given with saline 100 ml, gentamicin 240,000 U, lidocaine 100 mg, dexamethasone 10 mg three times a day half an hour before meals Spray, and pay attention to oral hygiene. Mouth opening restriction is a long-term radiotherapy reaction of nasopharyngeal carcinoma patients, and there is no special treatment. Patients should frequently do mouth opening exercises during and after radiotherapy to prevent fibrosis of masticatory muscles and surrounding tissues. Once mouth opening restriction occurs, patients should be instructed to perform functional exercises. Alanamide-glutamine (trade name Leptin), applied before and during radiotherapy, can significantly reduce the oral inflammatory reaction and other side effects caused by radiotherapy, but this drug is more expensive, so patients can suggest their primary doctors to apply it according to their own economic situation. 3. The reduction of food intake after surgery for tumor patients usually occurs after gastrointestinal surgery, and with the gradual recovery of gastrointestinal function, the amount of food intake will gradually return to normal. It should be noted that after gastrectomy, the remaining gastric tissues will not be regenerated, but the muscle fibers of the stomach will be compensated to elongate. Therefore, about six months after major gastrectomy, the volume of the residual stomach will increase, and the patient’s meal volume can be restored to normal. However, after total gastrectomy, the jejunum is usually applied clinically as a substitute for the stomach, and patients usually need to keep the habit of eating less and more for a long time. In conclusion, no matter which situation leads to reduced eating, according to the specific situation of the patient, a reasonable balanced diet is selected, and the food is processed and cooked to become extremely fine and soft, easy to swallow, and easy to digest and absorb. Set a reasonable amount of energy supply to meet the needs while avoiding excess. Protein, fat and sugar should account for 12%-15%, 25%-35% and 50% of total energy respectively, with animal and legume protein accounting for 30%-50% of total protein. Food should contain the right amount of dietary fiber, vitamin supply should be sufficient, fresh vegetables and fruits should be eaten every day, the intake of minerals and trace elements should be able to meet the needs of the body, and pay attention to the zinc to copper ratio and calcium to phosphorus ratio. The intake of minerals and trace elements should be sufficient to meet the body’s needs.