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The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States

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  • James Feyrer
  • Dimitra Politi
  • David N. Weil

Abstract

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 United States by taking advantage of this natural geographic variation. Salt was iodized over a short period of time beginning in 1924. We use military data collected during World War I and World War II 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 intelligence quotient (IQ) by approximately one standard deviation. Our results can explain roughly one decade’s worth of the upward trend in IQ in the United States (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.

Suggested Citation

  • James Feyrer & Dimitra Politi & David N. Weil, 2017. "The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States," Journal of the European Economic Association, European Economic Association, vol. 15(2), pages 355-387.
    • Handle: RePEc:oup:jeurec:v:15:y:2017:i:2:p:355-387.
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    File URL: http://hdl.handle.net/10.1093/jeea/jvw002
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    1. Bishai, David & Nalubola, Ritu, 2002. "The History of Food Fortification in the United States: Its Relevance for Current Fortification Efforts in Developing Countries," Economic Development and Cultural Change, University of Chicago Press, vol. 51(1), pages 37-53, October.
    2. Erica Field & Omar Robles & Maximo Torero, 2009. "Iodine Deficiency and Schooling Attainment in Tanzania," American Economic Journal: Applied Economics, American Economic Association, vol. 1(4), pages 140-169, October.
    3. Anonymous, 1960. "World Health Organization," International Organization, Cambridge University Press, vol. 14(4), pages 673-674, October.
    4. Ferrie, Joseph P. & Rolf, Karen & Troesken, Werner, 2012. "Cognitive disparities, lead plumbing, and water chemistry: Prior exposure to water-borne lead and intelligence test scores among World War Two U.S. Army enlistees," Economics & Human Biology, Elsevier, vol. 10(1), pages 98-111.
    5. Politi, Dimitra, 2010. "The Impact of Iodine Deficiency Eradication on Schooling: Evidence from the Introduction of Iodized Salt in Switzerland," SIRE Discussion Papers 2010-02, Scottish Institute for Research in Economics (SIRE).
    6. Watson, Tara, 2006. "Public health investments and the infant mortality gap: Evidence from federal sanitation interventions on U.S. Indian reservations," Journal of Public Economics, Elsevier, vol. 90(8-9), pages 1537-1560, September.
    7. Markel, H., 1987. "'When it rains it pours': Endemic goiter, iodized salt, and David Murray Cowie, MD," American Journal of Public Health, American Public Health Association, vol. 77(2), pages 219-229.
    8. Jere R. Behrman & Mark R. Rosenzweig, 2004. "Returns to Birthweight," The Review of Economics and Statistics, MIT Press, vol. 86(2), pages 586-601, May.
    9. Hoyt Bleakley, 2007. "Disease and Development: Evidence from Hookworm Eradication in the American South," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 122(1), pages 73-117.
    10. Anonymous, 1960. "World Health Organization," International Organization, Cambridge University Press, vol. 14(3), pages 473-475, July.
    11. Anonymous, 1960. "World Health Organization," International Organization, Cambridge University Press, vol. 14(1), pages 212-214, January.
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    More about this item

    JEL classification:

    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity
    • N32 - Economic History - - Labor and Consumers, Demography, Education, Health, Welfare, Income, Wealth, Religion, and Philanthropy - - - U.S.; Canada: 1913-

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