Maternal Folate Intake during Pregnancy and Childhood Asthma in a Population-based Cohort

A potential adverse effect of high folate intake during pregnancy on children's asthma development remains controversial. To prospectively investigate folate intake from both food and supplements during pregnancy and asthma at age 7 years when the diagnosis is more reliable than at preschool ag...

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Vydané v:American journal of respiratory and critical care medicine Ročník 195; číslo 2; s. 221 - 228
Hlavní autori: Parr, Christine L., Magnus, Maria C., Karlstad, Øystein, Haugen, Margaretha, Refsum, Helga, Ueland, Per M., McCann, Adrian, Nafstad, Per, Håberg, Siri E., Nystad, Wenche, London, Stephanie J.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States American Thoracic Society 15.01.2017
Predmet:
Adult
Asthma - epidemiology
Asthma - etiology
Child
Dietary Supplements - adverse effects
Female
Folic Acid - adverse effects
Humans
Male
Norway - epidemiology
Original
Pregnancy
Prenatal Exposure Delayed Effects - epidemiology
Prenatal Exposure Delayed Effects - etiology
Prospective Studies
Risk Factors
Surveys and Questionnaires
maternal diet
epidemiology
folic acid
birth cohort
children’s asthma development
ISSN:1073-449X, 1535-4970, 1535-4970
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Popis
Shrnutí:A potential adverse effect of high folate intake during pregnancy on children's asthma development remains controversial. To prospectively investigate folate intake from both food and supplements during pregnancy and asthma at age 7 years when the diagnosis is more reliable than at preschool age. This study included eligible children born 2002-2006 from the Norwegian Mother and Child Cohort Study, a population-based pregnancy cohort, linked to the Norwegian Prescription Database. Current asthma at age 7 was defined by asthma medications dispensed at least twice in the year (1,901 cases; n = 39,846) or by maternal questionnaire report (1,624 cases; n = 28,872). Maternal folate intake was assessed with a food frequency questionnaire validated against plasma folate. We used log-binomial and multinomial regression to calculate adjusted relative risks with 95% confidence intervals. Risk of asthma was increased in the highest versus lowest quintile of total folate intake with an adjusted relative risk of 1.23 (95% confidence interval, 1.06-1.44) that was similar for maternally reported asthma. Mothers in the highest quintile had a relatively high intake of food folate (median, 308; interquartile range, 241-366 μg/d) and nearly all took at least 400 μg/d of supplemental folic acid (median, 500; interquartile range, 400-600 μg/d). In this large prospective population-based cohort with essentially complete follow-up, pregnant women taking supplemental folic acid at or above the recommended dose, combined with a diet rich in folate, reach a total folate intake level associated with a slightly increased risk of asthma in children.
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These authors contributed equally.
ISSN:1073-449X
1535-4970
1535-4970
DOI:10.1164/rccm.201604-0788OC