Cognitive Consequences of Iodine Deficiency in Adolescence: Evidence from Salt Iodization in Denmark

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Abstract

Over the past three decades, many countries have introduced iodized salt policies to eradicate iodine deficiency. Iodine deficiency in utero is detrimental to cognitive ability, but little is known about the consequences of iodine deficiencies after birth. This paper examines the impact of iodine deficiency in adolescence on school performance. I exploit the introduction of iodized salt in Denmark during 1998-2001 as a natural experiment. Combining administrative records on high school grades over a thirty-year period with geographic variation in initial iodine deficiency, I find that salt iodization increases the GPA of students by 6-9 percent of a standard deviation.
Original languageEnglish
JournalScandinavian Journal of Economics
Number of pages39
ISSN0347-0520
DOIs
Publication statusPublished - 29 Jan 2022

Bibliographical note

Epub ahead of print. Published online: 29 January 2022.

Keywords

  • Iodine deficiency
  • Iodized salt
  • Nutrition
  • Human capital
  • Health

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