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Amorougen t1_iredy81 wrote on October 7, 2022 at 12:55 PM

Reply to comment by NeedlessUnification in TIL A 2017 study found that the introduction of iodized salt in 1924 raised the IQ for the one-quarter of the population most deficient in iodine. by kstinfo

Supposedly, people from iodine insufficient midwest ate potato peeling (as in baked potatoes) to provide iodine and prevent goiter. Iodized salt made that unnecessary.