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A comment on In Raising the World’s I.Q., the Secret’s in the Salt (2006). Parent comment

Re:In Raising the World’s I.Q., the Secret’s in the Salt (2006) by Iv on Tuesday December 19, 2017 @10:35AM (#15960862)
Western population used to suffer from iodine deficiency: retardation, fetus malformations, dysfunctional thyroid.

This is one of the many little invisible progresses that has steadily made our life expectancy increase all over the 20th century.

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Re:In Raising the World’s I.Q., the Secret’s in the Salt (2006) by swimfar on Tuesday December 19, 2017 @11:14AM (#15961193)
I know the question was specifically about Western countries, but this comment (unintentionally) makes it sound like it's only been a western problem. This was a big problem in China and is still an issue today [1] (although the numbers in that article aren't really specific to China).

https://en.wikipedia.org/wiki/Iodine_deficiency_in_China

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