Lung cancer patients can eat grapefruit with no special requirements. Grapefruit is rich in vitamins and is a relatively beneficial fruit, which is also good for the health of lung cancer patients, depending on patients’ own taste. Lung cancer is a malignant tumor of the respiratory system and does not involve the digestive tract, so there is no special requirement for diet. It is recommended to have a light diet and not to eat too much spicy and greasy food, and pay attention to eating less and more meals. Eat more fresh vegetables and fruits, which help replenish vitamins and are good for health. Smoking and drinking must be avoided. Smoking has a great impact on the lungs, and also has a bad impact on the stomach and cardiovascular system, so it must be avoided.