RunningNumbers t1_irh332d wrote on October 8, 2022 at 2:08 AM

Reply to comment by Happiercalif 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

It distributes on land from evaporated ocean water. Plants and grazing animals then absorb it. You can get plenty of iodine from mills. Mountains are often iodine deficient since most water runs down hill rather than gets into the soil.

Happiercalif t1_irhdom4 wrote on October 8, 2022 at 3:57 AM

I don't think that's true except possibly for very near the ocean. In the 1990s I read research about the Mongolians being very iodine deficient.

EDIT if you look up the Goiter Belt, it doesn't correlate to mountains. The Great Lakes region was especially bad, for instance.

RunningNumbers t1_irhf8ia wrote on October 8, 2022 at 4:15 AM

https://pubs.acs.org/doi/10.1021/acs.est.8b05533#

Historically oceans have been seen as a primary source of iodine I precipitation but apparently there are other sources in the water cycle.

Also ocean precipitation goes far in land. Rain clouds that from into the Gulf of Mexico go well into Canada. They intercept cold fronts coming south and make T storms.

RunningNumbers t1_irhffdr wrote on October 8, 2022 at 4:17 AM

You should look again at the map and then look at topography of the US before you make that assertion about correlation.

Happiercalif t1_irhhfjo wrote on October 8, 2022 at 4:42 AM

I have.