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来源类型Working Paper
规范类型报告
DOI10.3386/w19233
来源IDWorking Paper 19233
The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States
James Feyrer; Dimitra Politi; David N. Weil
发表日期2013-07-18
出版年2013
语种英语
摘要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 WWI and WWII to compare outcomes of cohorts born before and after iodization, in localities that were naturally poor and rich in iodine. We find that for the one quarter of the population most deficient in iodine this intervention raised IQ by approximately one standard deviation. Our results can explain roughly one decade's worth of the upwardtrend in IQ in the US (the Flynn Effect). We also document a large increase in thyroid related deaths following the countrywide adoption of iodized salt, which affected mostly older individuals in localities with high prevalence of iodine deficiency.
主题Health, Education, and Welfare ; Health ; Education ; Labor Economics ; Labor Supply and Demand ; History ; Labor and Health History
URLhttps://www.nber.org/papers/w19233
来源智库National Bureau of Economic Research (United States)
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资源类型智库出版物
条目标识符http://119.78.100.153/handle/2XGU8XDN/576907
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GB/T 7714
James Feyrer,Dimitra Politi,David N. Weil. The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States. 2013.
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