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Fish oil in various doses or flax oil in pregnancy and timing of spontaneous delivery: a randomised controlled trial

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To test the earlier suggested hypothesis that intake of long-chain n-3 fatty acids from fish oil may delay the timing of spontaneous delivery and to test if alpha-linolenic acid, provided as flax oil capsules, shows the same effect. Design 

Randomised controlled trial including women reporting low dietary fish intake. The women were allocated in the proportions of 1:1:1:1:1:1:2 into six treatment groups and a control group, respectively, from week 17–27 of gestation. The treatment groups received fish oil, in various doses, or flax oil, and the control group did not receive any treatment. Setting 

The Danish National Birth Cohort. Sample 

A total of 3098 women allocated into six treatment groups and one control group. Methods 

The six intervention groups were offered fish oil capsules in doses of 0.1, 0.3, 0.7, 1.4 and 2.8 g of eicosapentaenoic acid and docosahexaenoic acid per day or 2.2 g of alpha-linolenic acid (ALA) per day from week 17–27 of gestation until delivery. Main outcome measures 

Timing of spontaneous delivery. Results 

No differences in timing of spontaneous delivery was detected in the fish oil groups or the flax oil group, compared with the control group. The difference in timing of spontaneous delivery in the group receiving the highest fish oil dose compared with the control group was 0.8 days (95% CI: –2.3 to 1.0). Only a minority of the women in the intervention groups took capsules until delivery. Conclusion 

Possible explanations for these findings include no true effect of n-3 fatty acids on spontaneous delivery or a quick-acting effect not detectable in this trial.

Keywords: Danish National Birth Cohort; long-chain n-3 fatty acids; pregnancy; randomised trial

Document Type: Research Article


Affiliations: 1: Department of Pharmacology, The Danish University of Pharmaceutical Sciences, Copenhagen, Denmark 2: Maternal Nutrition Group, Department of Epidemiology Research, Statens Serum Institut, Copenhagen S, Denmark 3: Biochemistry and Nutrition Group, BioCentrum—DTU, Technical University of Denmark, Lyngby, Denmark

Publication date: 2006-05-01

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