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Iodine intake from supplements and diet during pregnancy and child cognitive and motor development: the INMA Mother and Child Cohort Study
  1. Mario Murcia1,2,
  2. Mercedes Espada3,
  3. Jordi Julvez1,4,5,6,
  4. Sabrina Llop1,2,
  5. Maria-Jose Lopez-Espinosa1,2,
  6. Jesus Vioque1,7,
  7. Mikel Basterrechea1,8,9,
  8. Isolina Riaño1,10,
  9. Llucia González2,11,
  10. Mar Alvarez-Pedrerol1,4,5,
  11. Adonina Tardón1,12,
  12. Jesús Ibarluzea1,9,
  13. Marisa Rebagliato1,2,11
  1. 1CIBER Epidemiología y Salud Pública (CIBERESP), Spain
  2. 2Epidemiology and Environmental Health Joint Research Unit, FISABIO-Universitat Jaume I-Universitat de València, Valencia, Spain
  3. 3Clinical Chemistry Unit, Public Health Laboratory of Bilbao, Bilbao, Spain
  4. 4ISGlobal, Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
  5. 5Universitat Pompeu Fabra, Barcelona, Spain
  6. 6Hospital del Mar Research Institute (IMIM), Barcelona, Spain
  7. 7Departamento de Salud Pública, Universidad Miguel Hernández, San Juan de Alicante, Spain
  8. 8Public Health Division of Gipuzkoa, Basque Government’s Health Department, San Sebastián, Spain
  9. 9Health Research Institute (BIODONOSTIA), San Sebastián, Spain
  10. 10Pediatric Unit, Hospital San Agustin, Aviles, Spain
  11. 11Medicine Department, Universitat Jaume I, Castelló de la Plana, Spain
  12. 12Departamento de Medicina, IUOPA-Universidad de Oviedo, Oviedo, Spain
  1. Correspondence to Dr Mario Murcia, Unit of Environment and Health, Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO), Valencia, 46020, Spain; murcia_mar{at}gva.es

Abstract

Background The effect of mild-to-moderate maternal iodine deficiency on the neuropsychological development of their offspring is uncertain. We aimed to assess the association between iodine status during pregnancy and the cognitive and motor development of children at 4–5 years.

Methods We conducted a prospective cohort study in four Spanish regions with recruitment of pregnant women between 2003 and 2008 and follow-up of their children up to 4–5 years (mean (SD)=4.8 (0.6)). Cognitive and motor function was assessed in 1803 children using the McCarthy Scales of Children’s Abilities. Dietary iodine and supplementation were measured through questionnaires twice during pregnancy. Urinary iodine concentration (UIC) was measured in spot samples. The residuals of a regression of UIC against creatinine were used to define a variable corrected for creatinine (UIC~Cr).

Results Neither iodine supplements nor iodised salt consumption or maternal UIC were associated with cognitive or motor function. After adjusting for creatinine, children of women with UIC~Cr <100 µg/L had 3.93 (95% CI −6.18 to –1.69) general cognitive scores lower than the reference (150–249 µg/L). Dietary iodine was inversely associated with motor scores and milk but not other dairy products or seafood consumption accounted for this association (beta: −1.36; 95% CI −2.12 to –0.61; per one daily milk serving).

Conclusions We found an association between low maternal urinary iodine and lower cognitive scores in childhood, although only when corrected for creatinine, adding to the evidence that iodine deficiency may have potential harmful effects on neurodevelopment. Iodine supplementation does not appear to improve child’s neurodevelopment at 4–5 years.

  • nutrition
  • pregnancy
  • longitudinal studies
  • public health policy

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Footnotes

  • Contributors MM, ME, JJ, JI and MR designed the research; ME, SL, M-JL-E, MB, IR, LG, MA-P and AT conducted the research; MM and JV analysed the data; MM and MR wrote the paper and had primary responsibility for final content. All authors read and approved the final manuscript.

  • Funding This work was supported by grants from the European Union: NEW GENERIS FP6-2003-Food-3-A-016320, FP7-ENV-2011 cod 282957, HEALTH.2010.2.4.5-1; Spain: Instituto de Salud Carlos III (G03/176, CB06/02/0041; FIS-FEDER: 04/2018, 04/1436, 05/1079, 07/0314, 08/1151, 09/02311, 11/01007, 11/02591, 11/02038, 13/1944, 13/02429, 14/00891 and 14/01687 and Miguel Servet-FEDER CP11/00178, CP15/00025); Generalitat Valenciana: FISABIO (UGP 15-230, UGP-15-244 and UGP-15-249); Generalitat de Catalunya (CIRIT 1999SGR 00241); Department of Health of the Basque Government (2005111093 and 2009111069); the Provincial Government of Gipuzkoa (DFG06/004 and DFG08/001); Obra Social Cajastur; and University of Oviedo.

  • Competing interests None declared.

  • Ethics approval The Hospital Ethics Committees of each area approved the research protocol: Hospital La Fe de Valencia, Hospital de Sabadell – Corporació Parc Taulí or Hospital de Terrassa, Hospital Universitario Central de Oviedo and Hospital de Cruces in Barakaldo.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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