J. Lipid Res.
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Journal of Lipid Research, Vol. 40, 2322-2332, December 1999
Copyright © 1999 by Lipid Research, Inc.


Original Article

Fractional oxidation of chylomicron-derived oleate is greater than that of palmitate in healthy adults fed frequent small meals

Dorothy E. Schmidta,c, John B. Allredc, and C. Lawrence Kiena,b,c
a Children's Research Institute, The Ohio State University, Room W209, Children's Hospital, 700 Children's Drive, Columbus, OH 43205-2696
b Department of Pediatrics, The Ohio State University, Room W209, Children's Hospital, 700 Children's Drive, Columbus, OH 43205-2696
c The Ohio State University Nutrition Program, The Ohio State University, Room W209, Children's Hospital, 700 Children's Drive, Columbus, OH 43205-2696

Correspondence to: C. Lawrence Kien

Differences in oxidation of individual dietary fatty acids could contribute to the effect of dietary fat composition on risk factors for non-insulin-dependent diabetes mellitus and cardiovascular disease. Using a novel stable isotope technique, we compared fractional oxidation of chylomicron-derived oleate and palmitate in 10 healthy adults in a crossover study. 1-13C-labeled oleate or palmitate was emulsified into a eucaloric formula diet administered each 20 min for 7 h to produce a plateau in excretion of 13C label in breath CO2. Unlabeled oleate and palmitate each provided 16% of dietary energy, and other fatty acids provided 8% of energy. Total dietary fat was 40% of energy, carbohydrate was 46%, and protein was 14%. Diet without tracer was fed for 2 h before beginning tracer administration to establish a baseline fed state. Relative oxidation of oleate versus palmitate was defined as fractional oxidation of oleate divided by fractional oxidation of palmitate. Relative oxidation averaged 1.21 (99.5% confidence interval = 1.03;–1.39), indicating that fractional oxidation of oleate was significantly greater than that of palmitate.—Schmidt, D. E., J. B. Allred, and C. L. Kien. Fractional oxidation of chylomicron-derived oleate is greater than that of palmitate in healthy adults fed frequent small meals. J. Lipid Res. 1999. 40: 2322;–2332.

Supplementary key words: dietary fat, chylomicrons, fatty acid oxidation, stable isotopes


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