American Journal of Clinical Nutrition, Vol 58, 477-483, Copyright © 1993 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Different postprandial metabolism of olive oil and soybean oil: a possible mechanism of the high-density lipoprotein conserving effect of olive oil

TW offBruin, CB Brouwer, M van Linde-Sibenius Trip, H Jansen and DW Erkelens
Department of Medicine, Academic Hospital Utrecht, The Netherlands.

The postprandial lipoprotein metabolism of two orally administered vitamin A-fat loads consisting of either 20% (wt:vol) soybean oil or 17% olive oil plus 3% soybean oil was studied in six normolipidemic young men according to a randomized crossover design. Mean (+/- SEM) retinyl palmitate concentrations (area under the 24-h curve) were higher in olive oil chylomicrons (97.3 +/- 5.5 mmol.L-1 x h-1), than in soybean-oil chylomicrons (84.0 +/- 10.5 mmol.L-1 x h-1; P < 0.02). Apolipoprotein B-48 concentrations were higher in the olive oil chylomicron remnants with densities (d) of 1.006-1.019 compared with soybean-oil remnants. The slower removal of olive oil chylomicron remnants was correlated to hepatic lipase activity (r = 0.84, P < 0.02). The initial HDL-cholesterol concentration (0.87 +/- 0.17 mmol/L-- relatively low but within the normal range for young Dutch men) decreased significantly after ingestion of soybean oil to 0.66 +/- 0.10 mmol/L after 5 and 7 h, but no significant decrease was observed after olive oil ingestion. Soybean oil induced decreases in HDLs correlated inversely with hepatic lipase (r = -0.88, P < 0.02). The results suggested that competition between olive oil chylomicron remnants and HDL for hepatic lipase may have been the underlying mechanism that prevented the postprandial decrease in HDL cholesterol.

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