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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Composition of human VLDL triacylglycerols after ingestion of olive oil and high oleic sunflower oil.
Journal of Nutrition 1998 March
This work was undertaken to determine the effect of diets enriched with olive oil or high oleic sunflower oil on very low density lipoprotein (VLDL) triacylglycerol composition of healthy human subjects. Both oils contain a similar proportion of monounsaturated fatty acids (MUFA) but differ in their triacylglycerol composition. All 22 human subjects initially consumed a low fat, high carbohydrate diet as recommended by the National Cholesterol Education Program (NCEP-I). They then consumed the two experimental oils (40% dietary energy) in a crossover design. The olive oil and high oleic sunflower oil diets resulted in significant increases in palmitoleic (55%, P < 0.05), oleic (27%, P < 0.01) and eicosenoic (>100%, P < 0.001) acids of VLDL triacylglycerols, whereas there was a significant decrease in linoleic acid (38%, P < 0.001). In addition, the high oleic sunflower oil diet increased the content of stearic acid (60%, P < 0.05) and total saturated fatty acids (14%, P < 0.05). Both MUFA-rich diets significantly (P < 0.01) decreased the content of sn-glycerol-palmitate-linoleate-oleate, sn-glycerol-palmitoleate-dioleate and sn-glycerol-palmitate-dilinoleate in VLDL with regard to the NCEP-I diet, whereas they increased the content of sn-glycerol-trioleate (>100%, P < 0.001 after the olive oil diet; 80%, P < 0.05 after the high oleic sunflower oil diet). Intake of olive oil, in particular, significantly decreased the content of sn-glycerol-tripalmitate (36%, P < 0.01) and increased the content of dioleoyl-containing triacylglycerols. MUFA (P < 0.01) and arachidonic acid (P < 0.001) tended to be rich in the sn-2 position of VLDL triacylglycerols during the periods of consuming the olive oil or high oleic sunflower oil diets. In addition, olive oil, but not high oleic sunflower oil, further contributed to VLDL triacylglycerols that contained alpha-linolenic and docosahexaenoic acids acylated in the sn-2 position. These data suggest that differences in the composition of VLDL triacylglycerols may be of major importance in explaining the beneficial effects of dietary olive oil in reducing the atherogenic risk profile in healthy subjects.
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