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 2-10 kilograms of salt to prevent and treat goiter, which significantly reduces the incidence of hypothyroidism. This iodized salt is extremely suitable for endemic goiter areas. However, some patients with hypothyroidism are caused by excessive intake of iodine and should not be treated in one way or another, but must be treated with evidence. Supplemental iodized salt can be taken from iodized salt, but also 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 daily supply of high-quality protein should be at least more than 20 grams to maintain the balance of protein in the body. Once the protein is reduced, the necessary amino acids should be supplemented and sufficient protein should be supplied 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.