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Effect of low doses of long-chain n-3 PUFAs on endothelial function and arterial stiffness: a randomized controlled trial

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)973-980
Number of pages8
JournalThe American journal of clinical nutrition
Volume94
Issue number4
DOIs
Publication statusPublished - Oct 2011

King's Authors

Abstract

Background: The dietary intake of n−3 (omega-3) long-chain PUFAs (LC-PUFAs) from fish may improve endothelial function and arterial stiffness.

Objective: The objective was to test the hypothesis that increasing intakes of n−3 LC-PUFAs—equivalent to the consumption of 1, 2, or 4 portions of oily fish per week—favorably affects endothelial function and arterial stiffness.

Design: A parallel-design, randomized, double-blind study compared daily doses of 0.45, 0.9, and 1.8 g n−3 LC-PUFAs (EPA:DHA ratio of 1.51:1) with placebo (refined olive oil). The primary and secondary outcomes were changes in flow-mediated dilatation (FMD) of the brachial artery, arterial stiffness, and blood pressure. Nonsmoking men (n = 142) and women (n = 225) aged 45–70 y were randomly assigned to treatment for 12 mo; 312 subjects completed the intervention.

Results: Compliance with the intervention was corroborated by significant dose-dependent increases in the proportions of EPA and DHA in erythrocyte lipids and a 16.5% reduction in serum triacylglycerol concentrations with 1.8 g n−3 LC-PUFAs/d. FMD was lower in men than in women (P < 0.0001) and decreased with age (ρ = 0.270, P < 0.001) but was not significantly (P = 0.781) related to n−3 LC-PUFA intake. The mean changes in FMD (95% CIs) compared with placebo were 0.1% (−0.9%, 1.1%), −0.3% (−1.3%, 0.6%), and −0.3% (−1.3%, 0.7%) with daily intakes of 0.45, 0.9, and 1.8 g n−3 LC-PUFAs, respectively. No significant treatment effects were noted for arterial stiffness and central mean or 24-h ambulatory blood pressure.

Conclusion: Intakes of n−3 LC-PUFAs ≤1.8 g/d do not improve endothelial function in healthy adults. The trial is registered at controlled-trials.com as ISRCTN66664610.

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