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Am J Physiol Regul Integr Comp Physiol 261: R1084-R1088, 1991;
0363-6119/91 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 261, Issue 5 1084-R1088, Copyright © 1991 by American Physiological Society

ARTICLES

Enhanced acceptance and metabolism of fats by rats fed a high-fat diet

D. R. Reed, M. G. Tordoff and M. I. Friedman
Monell Chemical Senses Center, Philadelphia, Pennsylvania 19104-3308.

Rats fed a high-fat diet show greater acceptance of and preference for pure fats than do rats fed a high-carbohydrate diet. We tested the hypothesis that this differential intake of fat was due to diet-induced modifications of lipid absorption and oxidation. After an intragastric load of corn oil, rats adapted to a high-fat diet had greater increases in plasma triglyceride and ketone levels and a lower percentage of fecal fat than did rats adapted to an isocaloric high-carbohydrate diet. High-fat-fed rats given corn oil containing [14C]palmitic acid expired 14CO2 more rapidly and to a greater extent than did rats maintained on a high-carbohydrate diet. These results show that the greater acceptance of fat by rats fed a high-fat diet is associated with an increased capacity to absorb and oxidize fat.


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