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kangourou_mutant t1_irfj12u wrote

Reply to comment by Vectorman1989 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

I guess you're in the US? Here in France, salt has iodine and most toothpaste has fluorine, but none of the other additives you list.

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Vectorman1989 t1_irfjnce wrote

UK. I know our flour is fortified at the very least.

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masterventris t1_irg1fp3 wrote

We actually get iodine from milk in the UK, instead of in salt.

It was completely by accident too, farmers started giving iodine rich foods to cattle in the 1930s to help with some cattle health issues, and that caused iodine rich milk that basically cured the population!

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