In addition to the application of levothyroxine sodium tablets as prescribed by the doctor for treatment of hypothyroidism with low immunity, it is also recommended that nutrition be supplemented from the daily diet, and nutritional supplements are not recommended. Nutritional supplements may have unknown composition, in order to avoid aggravating the condition, it is recommended that daily dietary supplements can be used. The low immunity of hypothyroidism suggests consuming more selenium-rich foods, and more or less iodine-containing foods according to the cause of hypothyroidism, as follows: 1. Foods rich in selenium: Selenium is involved in the metabolism of many enzymes and the synthesis and secretion of thyroid hormones, which is beneficial to the recovery of patients with hypothyroidism. Foods rich in selenium include coarse grains, mushrooms and fungi. 2. Iodine-containing foods: For hypothyroidism caused by iodine deficiency, patients can consume more iodine-rich foods such as seafood. For hypothyroidism caused by autoimmune abnormality, patients should consume less iodine-rich foods such as seaweed, nori and algae. If any discomfort occurs after consuming the food, the patient should consult a doctor promptly for examination.