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Speaker 1: Brain with today's question, why do they add iodine to
Speaker 1: table salt? I have a box of salt in the
Speaker 1: kitchen and it says iodizes salt, and then at the
Speaker 1: bottom it says this salt supplies iodine and necessary nutrient
Speaker 1: On the ingredient label at lists potassium iodine at a
Speaker 1: concentration of zero point zero zero six percent. A quarter
Speaker 1: chea spoon of salt or one point five grams therefore
Speaker 1: provides sixty seven micrograms of iodine, which is out half
Speaker 1: of the US recommended daily allowance for iodine. The main
Speaker 1: reason that you need iodine is because of a gland
Speaker 1: in your neck called the thyroid gland. The thyroid gland
Speaker 1: produces two hormones, thyroxine and tri iodo thyroneine that your
Speaker 1: body uses during metabolism. Without these hormones, you start to
Speaker 1: feel tired, depressed, cold, weak, and so on. Iodine is
Speaker 1: an important element in these two hormones, so without iodine,
Speaker 1: your thyroid gland can't produce them. When start for iodine,
Speaker 1: the thyroid gland also swells up, and when it does
Speaker 1: it's called a goiter. Groiters can look pretty hideous. Your
Speaker 1: body doesn't need or contain very much iodine. You might
Speaker 1: have twenty or twenty five milligrams of iodine in your
Speaker 1: entire body right now. However, in some parts of the world,
Speaker 1: the soil contains no iodine at all, so plants contain
Speaker 1: no iodine, and therefore iodine deficitiency is a big problem.
Speaker 1: In the US, one part of the country that lacks
Speaker 1: iodine is the Great Lakes region, So companies started adding
Speaker 1: iodine to salt in the nineteen twenties to eliminate goiter
Speaker 1: and thyroid problems. If you live through the Cold War,
Speaker 1: you may have heard about the practice of taking iodine
Speaker 1: pills during the threat of a nuclear attack. When a
Speaker 1: nuclear bomb explodes, one substance it forms is radioactive iodine.
Speaker 1: If you eat drink or inhale this isotope. Your thyroid
Speaker 1: gland will concentrate it, and this can lead to a
Speaker 1: thyroid damage or cancer. By taking an iodine pill, you
Speaker 1: saturate your thyroid gland with iodine and prevent it from
Speaker 1: absorbing any of the radioactive iodine. For more on this
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