Lung adenocarcinoma needs to eat more protein-rich food and more vegetables and fruits to supplement nutrition during chemotherapy, and the diet should be light and easy to digest. Lung adenocarcinoma is a kind of malignant tumor, which is a chronic consumptive disease, so you need to eat proper food to ensure proper weight to avoid immunity decline. Chemotherapy kills cancer cells and normal cells at the same time, so it is necessary to supplement sufficient protein, vitamins and minerals to strengthen the body. Protein can be supplemented by eating fish, poultry, eggs, etc., vitamins can be supplemented by consuming dark fruits and vegetables such as spinach, papaya, etc., and dietary fiber and minerals can be consumed appropriately. During chemotherapy, the diet should be light and easy to digest, if the chemotherapy drugs lead to poor appetite or nausea, vomiting, unable to eat food can be supported by parenteral and enteral nutrition, so as to avoid weight loss, unable to sustain the treatment. During chemotherapy, you need to strictly follow the doctor’s instructions, while ensuring psychological health.