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GMJ News > GMJ Briefs > Key Finding: Prenatal Iodine Deficiency Linked to Lower Verbal Intelligence in Adolescence, UK Study Finds

Key Finding: Prenatal Iodine Deficiency Linked to Lower Verbal Intelligence in Adolescence, UK Study Finds

GMJ
Last updated: 11/08/2026 11:29
By
Prof. Giorgi Pkhakadze
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Graph showing relationship between maternal iodine deficiency and child vocabulary scores at age 15
A 15-year UK cohort study shows that severe prenatal iodine deficiency is associated with a 4-point decline in verbal intelligence at age 15, while abstract reasoning remains unaffected. Despite evidence of iodine's importance, many prenatal vitamins contain inadequate amounts of this critical micronutrient. — "Army scientists energize battery research" by U.S. Army Combat Capabilities Development Command is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/. (CC BY-SA 2.0)
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1 min read|34 words

4 T-score points lower on verbal intelligence at age 15 in children of mothers with severe first-trimester iodine deficiency—but abstract reasoning unaffected. ALSPAC cohort study, 1,211 UK mother-child pairs.

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GMJ Brief · Key Finding

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ByProf. Giorgi Pkhakadze
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Prof. Giorgi Pkhakadze, MD, MPH, PhD, is Editor-in-Chief of the Georgian Medical Journal and Chair of the Public Health Institute of Georgia (PHIG). He is Professor and Head of the Department of Social and Behavioural Sciences at David Tvildiani Medical University, and Secretary/Treasurer of the UEMS Section of Public Health. ORCID: 0000-0001-7609-4515.

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