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Am J Physiol Endocrinol Metab 241: E57-E63, 1981;
0193-1849/81 $5.00
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AJP - Endocrinology and Metabolism, Vol 241, Issue 1 57-E63, Copyright © 1981 by American Physiological Society

ARTICLES

Effect of changing dietary fat saturation on low-density lipoprotein metabolism in man

J. D. Turner, N. A. Le and W. V. Brown

The mechanism of change in low-density lipoprotein (LDL) levels by diets differing in fat saturation have been studied. Turnover of 125I-LDL was measured in eight subjects with type II hyperlipoproteinemia and in seven normal control subjects during two dietary periods containing 40% of calories as either safflower oil (polyunsaturated fat, PSF) or as lard (saturated fat, SF). Higher levels of LDL apoprotein and LDL-cholesterol were observed in both groups on saturated fat. Subjects with elevated LDL levels (type II) showed a more marked effect of polyunsaturated fat with 25% lower LDL production rate as compared to a reduction of only 10% for the control group. On the PSF diet, the production rate in type II (12.7 mg.kg-1.day-1) was not statistically different from normal subjects (10.5 mg.kg-1.day-1). On this diet, the higher levels of LDL cholesterol in the type II subjects (as compared to controls) were due to a lower fractional clearance rate, mean of 0.27/day compared to a mean of 0.39/day for the normal subjects. Although individuals with type II hyperlipoproteinemia may have a primary clearance defect, the major reduction in plasma cholesterol concentrations achieved with a diet high in polyunsaturated fat can be attributed to a significantly lower LDL production.


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