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Hay fever (allergic rhinitis) risk reduced 20 percent for each 100 IU of vitamin D during early pregnancy – Feb 2016

Prenatal, perinatal, and childhood vitamin D exposure and their association with childhood allergic rhinitis and allergic sensitization.

J Allergy Clin Immunol. 2016 Feb 10. pii: S0091-6749(16)00035-X. doi: 10.1016/j.jaci.2015.11.031. [Epub ahead of print]
Bunyavanich S1, Rifas-Shiman SL2, Platts-Mills TA3, Workman L3, Sordillo JE4, Camargo CA Jr5, Gillman MW2, Gold DR6, Litonjua AA6.

VitaminDWiki Summary

For 1248 women every 100 IU additional Vitamin D during 1st and 2nd trimesters
Resulted in 20% less chance of allergic rhinitis and allergic sensitization at age 7

Weak statistical significance:(r = -0.03 to 0.53). (strong = -0.05)

VitaminDWiki comments:

  1. Seems like more 100 IU vitamin D would be needed to make a difference
  2. If true, vitamin D should be added earlier in pregnancy (often started at 20th week)

See also VitaminDWiki
Allergic Rhinitis (hay fever) reduced by just 1,000 IU of vitamin D for 30 days – RCT Sept 2015
Respiratory Tract visits 2.5 less likely with vitamin D: Pregnancy 2000 IU, Infant 800 IU – RCT Oct 2014
800 IU Vitamin D while pregnant decrease child asthma by 2X- Sept 2010
Allergy - Overview
Search VitaminDWiki for "allergic rhinitis" or "hay fever" 16 items as of Feb 2016
Huge increase in food allergies in Australia may be due to low vitamin D


1Division of Allergy and Immunology, Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY; Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY. Electronic address: supinda at post.harvard.edu.
2Department of Population Medicine, Harvard Pilgrim Health Care Institute, Boston, Mass; Harvard Medical School, Boston, Mass.
3Asthma and Allergic Diseases Center, University of Virginia Health System, Charlottesville, Va.
4Harvard Medical School, Boston, Mass; Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass.
5Harvard Medical School, Boston, Mass; Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass; Department of Emergency Medicine, Massachusetts General Hospital, Boston, Mass.
6Harvard Medical School, Boston, Mass; Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass; Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Mass.

BACKGROUND:
The role of early-life vitamin D in childhood allergy is controversial.

OBJECTIVE:
We sought to assess vitamin D exposure in early life by multiple modalities and ascertain its association with childhood allergic rhinitis and allergic sensitization.

METHODS:
One thousand two hundred forty-eight mother-child pairs from a US prebirth cohort unselected for any disease were studied. Vitamin D exposure was assessed by measures of maternal intake during the first and second trimesters of pregnancy and serum 25-hydroxyvitamin D (25[OH]D) levels in mothers during pregnancy, cord blood, and children at school age (median age, 7.7 years; interquartile range, 1.0 years). Tests for associations between vitamin D exposure with ever allergic rhinitis, serum total IgE level, and allergen sensitization at school age were conducted.

RESULTS:
The correlations between maternal intake of vitamin D during pregnancy and serum 25(OH)D levels in pregnant mothers, cord blood, and children at school age were weak to moderate (r = -0.03 to 0.53).
Each 100 IU/d of food-based vitamin D intake during the first and second trimesters (equivalent to the amount of vitamin D in an 8 - ounce serving of milk) was associated with 21% and 20% reduced odds of ever allergic rhinitis at school age (odds ratios of 0.79 [95% CI, 0.67-0.92] and 0.80 [95% CI, 0.68-0.93]), respectively.
There were no associations between maternal supplemental vitamin D intake or serum 25(OH)D levels at any time point with ever allergic rhinitis. There were no associations between any vitamin D exposure and serum total IgE level or allergen sensitization at school age.

CONCLUSIONS:
Inclusion of foods containing vitamin D in maternal diets during pregnancy may have beneficial effects on childhood allergic rhinitis.

Copyright © 2016 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.

PMID: 26874366

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