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NeedlessUnification t1_ireb6f7 wrote

Reply to comment by awhq 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

From the revisionist history podcast, places near salt water tended to not be iodine insufficient, which is where the dr got the idea to add it to salt.

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Amorougen t1_iredy81 wrote

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

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