Vitamin D insufficiency in the first 6 months of infancy and challenge-proven IgE-mediated food allergy at 1 year of age: A case-cohort study

J. Molloy, J. J. Koplin, K. J. Allen, M. L K Tang, F. Collier, J. B. Carlin, R. Saffery, D. Burgner, Sarath Ranganathan, T. Dwyer, A. C. Ward, M. Moreno-Betancur, M. Clarke, A. L. Ponsonby, P. Vuillermin

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31 Citations (Scopus)

Abstract

Background: Ecological evidence suggests vitamin D insufficiency (VDI) due to lower ambient ultraviolet radiation (UVR) exposure may be a risk factor for IgE-mediated food allergy. However, there are no studies relating directly measured VDI during early infancy to subsequent challenge-proven food allergy. Objective: To prospectively investigate the association between VDI during infancy and challenge-proven food allergy at 1 year. Methods: In a birth cohort (n = 1074), we used a case-cohort design to compare 25-hydroxyvitamin D3 (25(OH)D3) levels among infants with food allergy vs a random subcohort (n = 274). The primary exposures were VDI (25(OH)D3 <50 nM) at birth and 6 months of age. Ambient UVR and time in the sun were combined to estimate UVR exposure dose. IgE-mediated food allergy status at 1 year was determined by formal challenge. Binomial regression was used to examine associations between VDI, UVR exposure dose and food allergy and investigate potential confounding. Results: Within the random subcohort, VDI was present in 45% (105/233) of newborns and 24% (55/227) of infants at 6 months. Food allergy prevalence at 1 year was 7.7% (61/786), and 6.5% (53/808) were egg-allergic. There was no evidence of an association between VDI at either birth (aRR 1.25, 95% CI 0.70-2.22) or 6 months (aRR 0.93, 95% CI 0.41-2.14) and food allergy at 1 year. Conclusions: There was no evidence that VDI during the first 6 months of infancy is a risk factor for food allergy at 1 year of age. These findings primarily relate to egg allergy, and larger studies are required.

Original languageEnglish
Pages (from-to)1222-1231
JournalAllergy: European Journal of Allergy and Clinical Immunology
Volume72
Issue number8
DOIs
Publication statusPublished - 23 Feb 2017

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