Looking here at a salt packet from ncdonalds. What is sodium sulucoaluminate? Also, dextrose and potassium iodide are present. Why isn’t salt just salt?
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In some areas where people didn’t eat a lot of iodine-rich saltwater seafood average IQ went up 15 points after the government mandated adding iodine to salt. (1924 in the US, so almost a hundred years ago.)
Iodine was originally added to prevent the deficiency disease goiter, but it was eventually found that even low level iodine deficiency could have adverse effects on brain development.
(In some countries iodine is added to dairy or plant-based milk or other common foods instead of salt.)
So standard table salt contains iodine for health, stuff to keep the iodine stable, and an anti-caking ingredient to keep the salt from clumping and crystallizing into bigger flakes.
https://www.discovermagazine.com/health/how-adding-iodine-to-salt-boosted-americans-iq
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