For cancer patients undergoing treatment, it is difficult to eat in the usual way because chemotherapy and radiation therapy often cause nausea and lack of appetite, and patients do not even have enough energy to eat because they are weak. Therefore, it is especially important for patients to eat well in order to maintain a certain level of energy while undergoing treatment, overcome side effects from chemotherapy and radiation therapy, and strengthen their resistance. Since the patient often finds eating meat bland and tasteless due to his lack of appetite, he can be made to eat more eggs, ice cream, cheese or foods made from these ingredients in order to give him the right amount of nutrients and protein. The ideal recipe is to eat 4 or more servings of fruits or vegetables, 4 or more servings of bread, cereals or pasta, and 2 to 3 servings of foods high in protein, such as: fish, chicken, meat, dairy products, fava beans, peas or dried fruits per day (half an apple, two slices of pineapple, a small banana, a slice of bread, half a chicken leg, 125 grams of beef, 100 grams of grain or a small half-dish of vegetables is equivalent to one serving). Patients should be encouraged to eat a variety of foods and a good dining environment should be created for them, such as a pot of flowers on the dining table. If a patient is constipated during treatment due to radiation, drug reactions or less variety of food, he should be allowed to eat more fiber-rich foods, such as fresh fruits, vegetables and grains, and drink more beverages. Also, fiber can cure diarrhea because it absorbs the liquid in the stool to make it coagulate. The results of modern medical research on the relationship between food and cancer show that certain foods have the effect of increasing or decreasing the risk of developing certain types of cancer. According to the study, the increasing mortality rate of prostate cancer, pancreatic cancer, breast cancer, uterine cancer, colon cancer, ovarian cancer, etc., which has a lot to do with obesity. For this reason, it is important to avoid absorbing too much fat in order to maintain a normal weight. Vitamin A can reduce the incidence of oral cancer, throat cancer and lung cancer. Dark green vegetables and dark yellow fruits are richer in vitamin A and C and should be eaten more often. In addition, eating more dark green vegetables is useful in inhibiting the spread of colon, rectal, stomach and lung cancers. Less cured and smoked foods, such as sausage and ham, should be eaten because these foods produce certain carcinogenic substances. Many research results show that people who consume foods with high salt content tend to suffer from high blood pressure. This is because eating too much salt increases the amount of sodium in the blood, which leads to narrowing of blood vessels and increases the pressure of blood on the walls of the tubes. Therefore, people with hypertension should strictly control the amount of salt they consume, not exceeding 2.5 mg of salt per day. When cooking, you can put some aromatic and edible leaves instead of some salt. For diabetic patients, doctors used to provide a predetermined standard recipe for them. Nowadays, the emphasis is on the individual, depending on the patient’s health, such as weight, the amount of cholesterol in the blood, and whether he or she is taking insulin or other medications for diabetes. People who are overweight have difficulty controlling their blood sugar levels, and weight loss is a prerequisite for blood sugar control, so such patients should limit their caloric absorption from fat to 30% of total calories while maintaining normal cholesterol levels. If insulin needs to be taken, recipes and daily activities should be adjusted and guidance from doctors and nutritionists should be sought. Insist on measuring blood sugar before meals and before going to sleep to maintain as normal a level as possible: 80-120 mg of sugar per liter of blood before eating and 100-140 mg when going to sleep. About 5% of women and 10% of men in the world have kidney stones by age 70. People with kidney stones should drink 3 to 4 liters of water a day to keep their urine flowing smoothly. If you have calcium stones, you should limit calcium absorption to less than 600 mg per day (normal adults absorb 1,000 to 1,500 mg per day), eat no more than 2 grams of salt, absorb less protein, and use a comprehensive recipe as a good idea. If the stone is of calcium oxalate, tea, chocolate, wild fruits and foods containing vitamin C should be consumed sparingly. Kidney failure occurs when the kidneys are unable to remove waste products from the blood, causing infection, damage, poisoning or other conditions of the kidneys. People with kidney failure should eat foods with less protein. Such foods help reduce nausea, vomiting, loss of appetite and other symptoms and protect kidney function. Also the amount of salt should be controlled. In the later stages of liver disease, the ammonia content of the blood may increase because protein produces ammonia during the metabolism process. Such patients should eat foods with less protein and more vegetables.