1.What kind of patients need “low iodine diet”? A: Low-iodine diet is often needed for patients with thyroid diseases, such as toxic diffuse goiter (Graves’ hyperthyroidism), Hashimoto’s thyroiditis, and patients who need iodine treatment after thyroid cancer surgery. Wen Qiang, Department of Nuclear Medicine, China-Japan Friendship Hospital of Jilin University, Jilin, China. 2. Is the “low iodine diet” a “lifelong system”? A: It varies from disease to disease. Hyperthyroidism must be on a low iodine diet until it is cured; patients who need iodine 131 treatment after thyroid cancer surgery need to maintain a low iodine diet for 3-4 weeks before and 3 months after treatment. Lifelong “high iodine” and “low iodine” diets are harmful to the human body, and even increase the chance of thyroid tumors.3. What can’t be eaten on a “low iodine diet”? Answer: (1) Iodized salt. Non-iodized salt can be purchased from local salt companies and pharmacies with a diagnosis or a certificate issued by a doctor. (You can come to our department to issue a certificate, Jilin Pharmacy has sales) (2) seafood: kelp, seaweed, seaweed content is very large, shrimp, sea fish and other seafood, including a kind of seafood made of snacks. (Freshwater fish can be eaten.) (3) Pickled foods, such as sauerkraut, sorrel, parsnips, moldy dried vegetables, bamboo shoots, sausages, etc.. (Try to eat as little as possible, we emphasize the low iodine diet, rather than an absolute diet without iodine, such as lean meat, eggs, soy products, milk and other foods are only relatively higher than the amount of iodine vegetables, etc., is not in the scope of the contraindications) (4) contrast agent: such as to do enhanced CT, MRI, and other tests need to be developed when the auxiliary contrast agent, and the contrast agent in the iodine agent, generally need to be measured after the above examination of the urinary iodine qualification can be carried out before the iodine-131 treatment. 131 treatment.