1, limit fat intake: fat is the body supply of calories and help fat-soluble vitamins absorption substances. In hypothyroidism, plasma cholesterol is excreted slowly, so the concentration of plasma cholesterol is high. The intake of fat should be limited to reduce the concentration of plasma cholesterol. 2. Iodized salt supplementation: In China, 1 gram of potassium iodide is usually used for every 2 to 10 kg of salt to prevent goiter and reduce the incidence of hypothyroidism significantly. This iodized salt is extremely suitable for endemic goiter endemic areas. Women during childbirth should pay more attention to iodized salt supplementation to prevent their offspring from developing cretinism due to maternal iodine deficiency. However, some patients with hypothyroidism are caused by excessive iodine intake and should not be treated as such, but must be treated with evidence. Supplementation with iodized salt, in addition to iodized salt, can be taken from iodized soy sauce and iodized bread, as well as from iodine-rich kelp and nori. Avoid cabbage, cabbage, rape, cassava, walnuts and other foods that may cause goiter. 3, supply enough protein: the amount of high-quality protein supplied per person per day should be at least more than 20 grams to maintain the balance of protein in the human body. Once the protein is reduced, it should be supplemented with necessary amino acids and supplied with sufficient protein to improve the condition. Therefore, more eggs, dairy, meat, fish, etc. should be consumed, and attention should be paid to the complementarity of plant and animal proteins.