Abstract
Objectives
Childhood obesity and iodine deficiency are global public health concerns. Whether maternal iodine status mediates overweight in infancy has yet to be explored. We aimed to assess the relationship between maternal iodine status and infant birth weight, including small and large for gestational age (SGA and LGA, respectively).
Methods
A prospective study was carried out among 134 mother–infant pairs from Israel. Maternal iodine intake and status were estimated via questionnaire and serum thyroglobulin (Tg), respectively. Estimated iodine intake below the Recommended Daily Allowance for iodine sufficiency in pregnancy (220 μg/d) considered Inadequate. Maternal and neonatal thyroid function and anthropometric measurements, as well as maternal thyroid antibodies were also tested.
Results
After screening, 118 participants met the inclusion criteria (distributed trimesters I, II and III: n = 3, n = 21, and n = 94, respectively). There was a negative association of iodine intake with Tg values among the study population. Maternal median Tg value was higher than the sufficiency cutoff (16.5 vs 13 µg/L), indicating insufficient iodine status. No SGA cases were found. Inadequate iodine intake was associated with maternal isolated hypothyroxinemia (OR = 3.4; 95% CI 1.2, 9.9) and higher birthweight (including macrosomia and LGA) rates. A suggestive association of elevated Tg with a greater risk of LGA was observed. Offsprings' birth weight percentiles were associated with Tg values in pregnant women with suggestive sufficient iodine status (n = 62, R2 = 0.11, p < 0.05).
Conclusions
Iodine status during pregnancy can be associated with newborn anthropometric index. Maternal inadequate iodine intake may alter fetal growth and might increase the risk of LGA among newborns. These initial findings support the need to further study the impact of iodine deficiency on newborns overweight in Israel and elsewhere.
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Acknowledgements
We are indebted to all of the PW participants who volunteered for this study; we wish to thank Prof. Lisa Rubin from Haifa University (Community Health Department) for discussion and reviewing this manuscript; and to Mrs. Ruhama Kremer and Hagit Afuta of the BUMCA Department of Obstetrics and Gynecology for their assistance with the ethical procedures and administration of the study at BUMCA.
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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
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YSO, SZ, EYA, and SS initiated and designed the study. DG, YSO, and SRR obtained the ethical approval. DG and SS recruited participants and obtained informed consent. SRR administered the dietary interviews and questionnaires and supervised the collection of the blood samples. SF, DA, and SA performed the assays. YSO collected and matched the PW and newborns results, analyzed the data, and prepared the draft and revisions of the manuscript. SZ, SRR, and CB had a significant role in the manuscript revision. All authors provided comments on the draft and approved the final manuscript.
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The research proposal was approved by the Helsinki Committee at BUMCA.
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All PW who participated in this study provided written informed consent after the research protocols were explained in detail.
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Ovadia, Y.S., Zangen, S., Rosen, S.R. et al. Maternal iodine deficiency: a newborns’ overweight risk factor? A prospective study. Arch Gynecol Obstet 305, 777–787 (2022). https://doi.org/10.1007/s00404-021-06261-x
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DOI: https://doi.org/10.1007/s00404-021-06261-x