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American Journal of Clinical Nutrition, Vol. 87, No. 4, 887-895, April 2008
© 2008 American Society for Nutrition

ORIGINAL RESEARCH COMMUNICATION

Maternal n–3, n–6, and trans fatty acid profile early in pregnancy and term birth weight: a prospective cohort study1,2,3

Manon van Eijsden1, Gerard Hornstra1, Marcel F van der Wal1, Tanja GM Vrijkotte1 and Gouke J Bonsel1

1 From the Department of Epidemiology, Documentation, and Health Promotion, Municipal Health Service, Amsterdam, The Netherlands (ME and MFW); the Department of Social Medicine, Public Health Epidemiology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (ME, TGMV, and GJB); the Nutrition and Toxicology Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands (GH); and the Institute Health Policy and Management, Erasmus Medical Centre, Rotterdam, The Netherlands (GJB)

Background: Maternal n–3, n–6, and trans fatty acids are claimed to affect fetal growth, yet evidence is limited.

Objective: We investigated the association between maternal n–3, n–6, and trans fatty acids measured early in pregnancy and fetal growth.

Design: Amsterdam pregnant women (n = 12 373) were invited to complete a questionnaire (response 67%) and donate blood around the 12th pregnancy week for nutrient analysis. For 4336 women, fatty acid concentrations were measured in plasma phospholipids (gas-liquid chromatography). Associations of these concentrations with birth weight and small-for-gestational-age (SGA) risk were analyzed (liveborn singleton term deliveries, n = 3704).

Results: Low concentrations of individual n–3 fatty acids and 20:3n–6, the precursor of arachidonic acid (20:4n–6), but high concentrations of the other n–6 fatty acids and the main dietary trans fatty acid (18:1n–9t) were associated with lower birth weight (estimated difference in univariate analysis –52 to –172 g for extreme quintile compared with middle quintile). In general, SGA risk increased accordingly. After adjustment for physiologic, lifestyle-related and sociodemographic factors, low concentrations of most n–3 fatty acids and 20:3n–6 and high concentrations of 20:4n–6 remained associated with lower birth weight (–52 to –57 g), higher SGA risk, or both (odds ratios: 1.38–1.50). Infants of the 7% of women with the most adverse fatty acid profile were on average 125 g lighter and twice as likely to be small for gestational age.

Conclusion: An adverse maternal fatty acid profile early in pregnancy is associated with reduced fetal growth, which, if confirmed, gives perspective for the dietary prevention of lower birth weight.






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