DrEnter t1_irgcd8n wrote
Reply to comment by quokka70 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
Salt fluoridation: https://pubmed.ncbi.nlm.nih.gov/24308394/
The water thing is a couple of things that I think I was confusing. Iodine is a normal part of drinking water treatment (almost all municipal drinking water is iodized to some extent), but iodizing enough for supplementary reasons is mostly used in areas where iodizing other things is impractical or more difficult. Incidentally, iodized flour is also a thing sometimes used. https://awwa.onlinelibrary.wiley.com/doi/abs/10.1002/j.1551-8833.1927.tb12646.x and https://www.sciencedirect.com/science/article/pii/S0278691515000939
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