Abstract
The kinetic behavior of orally ingested 18O-cholesterol was compared with that of orally ingested 13C5-cholesterol in two normocholesterolemic men and the hypocholesterolemic effect of soy protein was demonstrated in 12 hypercholesterolemic men. Our results indicated no difference in the metabolism of orally ingested 18O- and 13C5-cholesterol. The use of 18O-cholesterol and 13C5-cholesterol also allowed simultaneous estimation of fractional rates of cholesterol synthesis using the 2H2O method, which were calculated to be 5.76 and 8.17%/d for the two normocholesterolemic subjects. The percent reduction in plasma cholesterol levels were found to be greater when the hypercholesterolemic men were placed on a soy protein diet than on an animal protein diet.
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