Periodicals>Journal Article:  Feyrer, Politi, Weil (July 2013), The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States, National Bureau of Economic Research, July 2013, Retrieved on 2013-07-24
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    24 JUL 2013

     Iodization of Salt in 1924 Increased American IQs 15 Points

    Iodine deficiency is the leading cause of preventable mental retardation in the world today. The condition, which was common in the developed world until the introduction of iodized salt in the 1920s, is connected to low iodine levels in the soil and water. We examine the impact of salt iodization on cognitive outcomes in the US by taking advantage of this natural geographic variation. Salt was iodized over a very short period of time beginning in 1924. We use military data collected during W...
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    It dramatically reduced mental retardation, but temporarily increased death by hyperthyroid as iodine-depleted people overdosed.