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Conjugated linoleic acid supplementation alters the 6-mo change in fat oxidation during sleep - Source: American Journal of Clinical Nutrition, Sep 2007

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By RN Close, et al. • www.ProHealth.com • September 21, 2007


Background: Conjugated linoleic acid (CLA) is a family of positional and geometric isomers with 2 conjugated double bonds formed from linoleic acid and linolenic acid. CLA has a wide range of biological effects, including body fat reduction.

Objective: The aim of our study was to determine CLA's effects on energy expenditure, macronutrient utilization, and dietary fat oxidation in overweight adults after 6 mo of supplementation.

Design: We recruited 23 subjects from our main CLA efficacy study who were receiving either 4 g/d of 78% active CLA isomers (3.2 g/d: 39.2% cis-9,trans-11 and 38.5% trans-10,cis-12) or 4 g/d of safflower oil. Energy expenditure and substrate utilization were measured before and after 6 mo of CLA supplementation by using whole-room indirect calorimetry. Dietary fat oxidation was measured by using stable isotope-labeled oleate and palmitate.

Results:

  • Our substudy detected a difference in the change in fat utilization between the CLA (4 +/- 8 g) and placebo (-7 +/- 11 g) groups during sleep after 6 mo of supplementation.

  • In addition, the percentage of energy from protein was reduced during sleep in the CLA group (CLA: -3.3 +/- 2.6%; placebo: 0.3 +/- 5.7%).

  • We also detected a difference in the change in energy expenditure during sleep (CLA: 0 +/- 38 kcal; placebo: -43 +/- 90 kcal).

  • We did not detect a change in labeled dietary fat oxidation after 6 mo of CLA supplementation given with a breakfast meal.
  • Conclusion: Mixed isomer CLA supplementation, but not placebo, positively altered fat oxidation and energy expenditure during sleep.

    Source: American Journal of Clinical Nutrition, 2007 86(3); 797-804. PMID: 17823448, by Close RN, Schoeller DA, Watras AC, Nora EH. Departments of Nutritional Sciences and Internal Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA. [E-mail: dschoell@nutrisci.wisc.edu ]





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