WEBVTT - Why do they add iodine to salt?

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<v Speaker 1>stuff works dot com where smart happens. Hi, I'm Marshall

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<v Speaker 1>Brain with today's question, why do they add iodine to

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<v Speaker 1>table salt? I have a box of salt in the

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<v Speaker 1>kitchen and it says iodizes salt, and then at the

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<v Speaker 1>bottom it says this salt supplies iodine and necessary nutrient

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<v Speaker 1>On the ingredient label at lists potassium iodine at a

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<v Speaker 1>concentration of zero point zero zero six percent. A quarter

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<v Speaker 1>chea spoon of salt or one point five grams therefore

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<v Speaker 1>provides sixty seven micrograms of iodine, which is out half

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<v Speaker 1>of the US recommended daily allowance for iodine. The main

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<v Speaker 1>reason that you need iodine is because of a gland

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<v Speaker 1>in your neck called the thyroid gland. The thyroid gland

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<v Speaker 1>produces two hormones, thyroxine and tri iodo thyroneine that your

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<v Speaker 1>body uses during metabolism. Without these hormones, you start to

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<v Speaker 1>feel tired, depressed, cold, weak, and so on. Iodine is

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<v Speaker 1>an important element in these two hormones, so without iodine,

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<v Speaker 1>your thyroid gland can't produce them. When start for iodine,

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<v Speaker 1>the thyroid gland also swells up, and when it does

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<v Speaker 1>it's called a goiter. Groiters can look pretty hideous. Your

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<v Speaker 1>body doesn't need or contain very much iodine. You might

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<v Speaker 1>have twenty or twenty five milligrams of iodine in your

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<v Speaker 1>entire body right now. However, in some parts of the world,

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<v Speaker 1>the soil contains no iodine at all, so plants contain

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<v Speaker 1>no iodine, and therefore iodine deficitiency is a big problem.

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<v Speaker 1>In the US, one part of the country that lacks

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<v Speaker 1>iodine is the Great Lakes region, So companies started adding

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<v Speaker 1>iodine to salt in the nineteen twenties to eliminate goiter

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<v Speaker 1>and thyroid problems. If you live through the Cold War,

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<v Speaker 1>you may have heard about the practice of taking iodine

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<v Speaker 1>pills during the threat of a nuclear attack. When a

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<v Speaker 1>nuclear bomb explodes, one substance it forms is radioactive iodine.

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<v Speaker 1>If you eat drink or inhale this isotope. Your thyroid

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<v Speaker 1>gland will concentrate it, and this can lead to a

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<v Speaker 1>thyroid damage or cancer. By taking an iodine pill, you

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<v Speaker 1>saturate your thyroid gland with iodine and prevent it from

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<v Speaker 1>absorbing any of the radioactive iodine. For more on this

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<v Speaker 1>and thousands of other topics. Because it how stuff works,

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