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Late introduction of fish and eggs is associated with increased risk of allergy development - results from the FARMFLORA birth cohort.

Journal article
Authors K Jonsson
M Barman
Hilde Kristin Brekke
Bill Hesselmar
Agnes E Wold
Published in Food & nutrition research
Volume 61
Issue 1
Pages 1393306
ISSN 1654-661X
Publication year 2017
Published at Institute of Clinical Sciences, Department of Pediatrics
Institute of Biomedicine, Department of Infectious Medicine
Pages 1393306
Language en
Links dx.doi.org/10.1080/16546628.2017.13...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Pediatrics

Abstract

The prevalence of allergy is markedly low in children growing up on farms. An increasing number of studies indicate that the timing of food introduction may affect allergy development. We aimed to investigate if protection against allergy in farm environments may be mediated through differences in food-introduction practices between farm and non-farm families, using an explorative approach. Twenty-eight farm and 37 non-farm children were included in the FARMFLORA birth cohort. Practices of breastfeeding and introduction of formulas and complementary foods were collected by questionnaires at 6, 12, and 18 months of age. Allergy was diagnosed by pediatricians at 3 years of age. The only difference in food-introduction practices observed between farm and non-farm children was an earlier introduction of nuts in farmers (median month: 11 [IQR: 8-6] in farmers, 15 [12-19] in non-farmers). One farm child (4%) and 10 non-farm children (27%) were allergic at 3 years of age. Lower risk of allergy development was associated with early exclusive breastfeeding (continuous variable; OR = 0.59, 95% CI: 0.39-0.89), but also having received eggs (OR = 0.08, 95% CI: 0.13-0.54) and fish (logistic regression not applicable, P = 0.01 in likelihood ratio testing [χ2]) at 10 months of age or earlier compared to later. Our results were not affected by reverse causation, as judged by a questionnaire sent to the families in retrospect. Timing of introduction of complementary foods is unlikely to contribute to the lower risk of allergy among farm children. Although early exclusive breastfeeding was associated with a lower rate of allergy development, postponed introduction of complementary foods might increase the risk of developing allergy. Owing to the limited sample size, our results are only indicative, but support prior findings.

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