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Am J Physiol Regul Integr Comp Physiol 275: R667-R672, 1998;
0363-6119/98 $5.00
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Vol. 275, Issue 3, R667-R672, September 1998

Effects of conjugated linoleic acid on body fat and energy metabolism in the mouse

David B. West1,2, James P. Delany1,2, Patricia M. Camet1, Fawn Blohm1, Alycia A. Truett1, and Joseph Scimeca3

1 Pennington Biomedical Research Center, Louisiana State University, Baton Rouge 70808; 2 Department of Physiology, Louisiana State University Medical Center, New Orleans, Louisiana 70112; and 3 Nutrition Research, Kraft Foods Technology Center, Glenview, Illinois 60025

Conjugated linoleic acid (CLA) is a naturally occurring group of dienoic derivatives of linoleic acid found in the fat of beef and other ruminants. CLA is reported to have effects on both tumor development and body fat in animal models. To further characterize the metabolic effects of CLA, male AKR/J mice were fed a high-fat (45 kcal%) or low-fat (15 kcal%) diet with or without CLA (2.46 mg/kcal; 1.2 and 1.0% by weight in high- and low-fat diets, respectively) for 6 wk. CLA significantly reduced energy intake, growth rate, adipose depot weight, and carcass lipid and protein content independent of diet composition. Overall, the reduction of adipose depot weight ranged from 43 to 88%, with the retroperitoneal depot most sensitive to CLA. CLA significantly increased metabolic rate and decreased the nighttime respiratory quotient. These findings demonstrate that CLA reduces body fat by several mechanisms, including a reduced energy intake, increased metabolic rate, and a shift in the nocturnal fuel mix.

body composition; indirect calorimetry; obesity; fatty acids


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