“Iodine” in daily food is really everywhere, it is closely related to the thyroid hormone secreted by our thyroid organs, and has a huge effect. The relationship is so good, the effect is so great, should we eat more food containing “iodine”? Studies have confirmed that the relationship between iodine and thyroid disease is a “V” or “U” curve. Inadequate or excessive dietary iodine intake can damage thyroid function. The World Health Organization (WHO) recommends: healthy people (excluding pregnant and lactating women), the daily intake of iodine should be 150-200 micrograms; while pregnant and lactating women, the daily intake of iodine should be at least 250 Micrograms or more. For patients with differentiated thyroid cancer (mainly papillary cancer and follicular cancer), radical thyroid cancer surgery or radioactive iodine therapy (iodine 131) is required, and the doctor will advise you to “low iodine diet” or “no Iodine diet “. It is really too difficult to achieve an “iodine-free diet” in everyday foods. Foods contain more or less trace iodine. But we can achieve a “low iodine diet.” The Nuclear Medicine Branch of the Chinese Medical Association proposes a standard for a low-iodine diet: daily intake of iodine content below 50 micrograms for at least 1-2 weeks. Different foods have different iodine content, and some seafood products have higher iodine content, such as kelp, seaweed, octopus, and scallops. Among them, kelp and seaweed have the highest iodine content, followed by fish, shrimp, crab and shellfish. Next, meat has low iodine content, and plant foods have the lowest iodine content, especially fruits and vegetables. Low iodine diet requirements are so strict, what is the iodine content of each food, how to choose food? Here are a few food iodine content maps for everyone to learn and understand. Tr in the above table indicates that it is lower than the lower limit of the current detection method, or not detected. Therefore, cauliflower (cauliflower) and lettuce have almost no iodine content and can be eaten appropriately.