EFFECTS OF MODERATE AMOUNTS OF EMULSIFIED DIETARY-FAT ON POSTPRANDIALLIPEMIA AND LIPOPROTEINS IN NORMOLIPIDEMIC ADULTS

Eight normolipidemic males ingested a meal containing either 42 g fat or 31 g fat in the form of emulsions (9.0 and 9.2 m(2)) and a fixed am ount of retinyl palmitate. Fasting and postmeal blood samples were obt ained for 7 h. Serum and chylomicron triglyceride responses were relat ed to the amount of fat ingested and peaked after 2-3 h. The chylomicr on retinyl palmitate response was lower (P less than or equal to 0.05) with the 31-g fat supply. After the 42-g fat intake, but not after th e 31-g fat intake, serum free cholesterol and phospholipids increased and esterified cholesterol decreased postprandially. Significantly dif ferent responses were observed after both meals for low-density-lipopr otein (LDL) free cholesterol, very-low-density-lipoprotein (VLDL) and LDL esterified cholesterol, and high-density-lipoprotein (HDL) phospho lipids. These data show that ingesting 31 g instead of 42 g fat in a m eal reduces postmeal lipoprotein variations and suggest that a thresho ld level of dietary fat should be overcome to promote significant post prandial changes in lipoprotein particles.