Dietary supplementation with cis-9, trans-11 conjugated linoleic acid and aortic stiffness in overweight and obese adults

Ivonne Sluijs, Yvonne Plantinga, Baukje De Roos, Louise I. Mennen, Michiel L. Bots

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75 Citations (Scopus)


Background: Animal studies suggest that dietary cis-9, trans-11 (c9,t11) conjugated linoleic acid (CLA) may inhibit or regress the development of atherosclerosis. The effect of CLA on atherosclerosis has not been assessed in humans.

Objective: We investigated the effect of c9,t11 CLA supplementation on aortic pulse wave velocity (a marker of atherosclerosis) and on cardiovascular risk factors in overweight and obese but otherwise apparently healthy subjects.

Design: In a double-blind, randomized, placebo-controlled, parallel-group trial, we randomly assigned 401 subjects, aged 40-70 y and with a body mass index (in kg/m(2)) > 25, to receive either 4 g CLA/d (2.5 g c9,t11 CLA/d and 0.6 g trans-10, cis-12 CLA/d) or placebo supplements for 6 mo. Aortic pulse wave velocity, blood pressure, anthropometric characteristics, and concentrations of fasting lipid, glucose, insulin, and C-reactive protein were measured before and after supplementation.

Results: During the intervention, mean (+/- SE) pulse wave velocity did not change in the c9,t11 CLA group (Delta 0.00 +/- 0.07) compared with the placebo group (Delta 0.09 +/- 0.06). There was no effect of c9,t11 CLA supplementation on blood pressure, body composition, insulin resistance, or concentrations of lipid, glucose, and C-reactive protein.

Conclusion: This study does not support an antiatherosclerotic effect or an effect on cardiovascular risk factors of c9,t11 CLA. This trial was registered at as NCT00706745. Am J Clin Nutr 2010; 91: 175-83.

Original languageEnglish
Pages (from-to)175-183
Number of pages9
JournalThe American Journal of Clinical Nutrition
Issue number1
Early online date18 Nov 2009
Publication statusPublished - Jan 2010


  • pulse-wave velocity
  • modified Baecke questionnaire
  • LDL-phenotype-B
  • E knockout mice
  • fatty-acids
  • cardiovascular-disease
  • postmenopausal women
  • endothelial function
  • lipid-peroxidation
  • insulin-resistance


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