Sweet potatoes and potatoes are root food, rich in dietary fiber, vitamins and mineral elements, moderate consumption can promote intestinal peristalsis, which is conducive to waste discharge, and can be consumed by patients with lung adenocarcinoma. Sweet potatoes and potatoes as common ingredients, moderate consumption can promote the recovery of lung adenocarcinoma patients. However, it is not recommended for patients who are allergic to sweet potatoes or potatoes. In addition, patients with lung adenocarcinoma should eat more high quality protein, fresh fruits and vegetables, stop smoking and limit alcohol, and develop good living habits to promote the recovery of their condition. It is recommended that lung adenocarcinoma patients should formulate appropriate dietary plans under the guidance of specialists and nutritionists.