Nutrition Tips on Iodine and Radiation from Hazel Ng, R.D.

We need iodine for normal thyroid function, and for the production of thyroid hormones. Thyroid hormones regulate a number of physiologic processes, including growth, development, metabolism, and reproductive function. We can get iodine from fish, seaweed and seafood. Only a small amount of iodine (about 110-130 micrograms per day) is sufficient to maintain the body function. Below is the table for iodine content of common foods.

Recently, there is a rumor about taking iodine tablet and iodized salt can help to protect us from radiation. In fact, iodine tablets are prescribed to people who have exposed to 250mSv of radiation within 4 days. In order to have the protective effect, iodine tablets need to be taken 48 hours before or 8 hours after radiation exposure. So we cannot take the iodine tablets as preventive measure. Too much iodine may affect the thyroid function, it can cause goiter (the enlargement of the thyroid glands). Too much iodized salt intake might increase blood pressure and affect kidney function. If there is a question about whether you need iodine supplements, the best is to consult your primary care doctor or your dietitian.