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Abstract Title:

Maternal vitamin D intake during pregnancy is inversely associated with asthma and allergic rhinitis in 5-year-old children.

Abstract Source:

Clin Exp Allergy. 2009 Jun;39(6):875-82. PMID: 19522996

Abstract Author(s):

M Erkkola, M Kaila, B I Nwaru, C Kronberg-Kippilä, S Ahonen, J Nevalainen, R Veijola, J Pekkanen, J Ilonen, O Simell, M Knip, S M Virtanen

Article Affiliation:

Division of Nutrition, Department of Applied Chemistry and Microbiology, University of Helsinki, Helsinki, Finland. maijaliisa.erkkola@helsinki.fi

Abstract:

BACKGROUND: Vitamin D is known to have a number of immunological effects and it may play a role in preventing allergic diseases. Objectives To study the effect of maternal intake of vitamin D during pregnancy on the emergence of asthma, allergic rhinitis (AR), and atopic eczema by the age of 5 years in children with HLA-DQB1-conferred susceptibility for type 1 diabetes.

METHODS: Children (1669) participating in the population-based birth cohort study were followed for asthma, AR, and atopic eczema assessed by validated questionnaire at 5 years. Maternal diet was assessed by a food-frequency questionnaire.

RESULTS: The mean maternal intake of vitamin D was 5.1 (SD 2.6) microg from food and 1.4 (2.6) microg from supplements. Only 32% of the women were taking vitamin D supplements. When adjusted for potential confounders, maternal intake of vitamin D from food was negatively related to risk of asthma [hazard ratio (HR) 0.80; 95% confidence interval (CI) 0.64-0.99] and AR [HR 0.85; 95% CI 0.75-0.97]. Vitamin D supplements alone were not associated with any outcome. Adjustment for maternal intake of other dietary factors did not change the results.

CONCLUSION: Maternal vitamin D intake from foods during pregnancy may be negatively associated with risk of asthma and AR in childhood.

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