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A study was conducted to evaluate whether the composition of previous dietary fat affects the absorption and composition of lymph obtained after a meal of fish oil. Adult male Sprague-Dawley rats were fed diets containing either corn oil or fish oil (MaxEPA) for 2 weeks. They were then given intraduodenally a bolus of an emulsion of 0.5 ml of fish oil plus 0.5 ml of 20 mM sodium taurocholate. Intestinal lymph was collected from a cannula in the main intestinal lymph trunk for various times after oil administration. Rats proportion of the test dose fo fish oil than those fed corn oil. There was an effect of previous diet on the fatty acid composition of the lymph. Rats fed fish oil had a higher percentage of eicosapentaenoic and docosahexaenoic acids in the lymph lipids than those fed corn oil while those fed corn oil had a higher percentage of linoleic acid. These results rule out decreased intestinal absorption as a mechanism for the hypotriacylglycerolemic effect of dietary fish oils. They also indicate a significant contribution of endogenous lipids to the fatty acids in lymph.
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