Invasive lung adenocarcinoma early surgery after chemotherapy weight in the drop should pay attention to dietary adjustments, such as the use of semi-liquid or fluid and other easily digestible food, eat less and more frequent meals, etc.; and recommended to seek medical attention to assess the disease, to exclude the possibility of tumor recurrence and metastasis. During chemotherapy, there will be digestive reactions, resulting in serious impact on the patient’s appetite. At this time, dietary habits need to be adjusted, and a light, liquid, semi-liquid diet is more suitable for these patients. Of course, attention should be paid to the intake of high-quality protein, fruits and vegetables. Be sure to avoid high-fat, spicy and stimulating diet. Patients who eat less can consider increasing the intake of nutritional powder, nutritional liquid, and can eat less and more meals to increase nutrition. Evaluating the whole body is mainly to exclude recurrence and metastasis, even early lung adenocarcinoma has the possibility of recurrence and metastasis, which should be closely watched. Therefore, those who lose weight during chemotherapy in early stage of lung cancer should adjust their diet and also need to exclude the possibility of recurrence and metastasis.