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The Journal of Lipid Research, Vol. 40, 593-600, April 1999
Copyright © 1999 by Lipid Research, Inc.

Original Article

Serum sterols during stanol ester feeding in a mildly hypercholesterolemic population

Correspondence to: T. A. Miettinen

We investigated the changes of cholesterol and non-cholesterol sterol metabolism during plant stanol ester margarine feeding in 153 hypercholesterolemic subjects. Rapeseed oil (canola oil) margarine without (n = 51) and with (n = 102) stanol (2 or 3 g/day) ester was used for 1 year. Serum sterols were analyzed with gas–liquid chromatography. The latter showed a small increase in sitostanol peak during stanol ester margarine eating. Cholestanol, campesterol, and sitosterol proportions to cholesterol were significantly reduced by 5–39% (P < 0.05 or less for all) by stanol esters; the higher their baseline proportions the higher were their reductions. The precursor sterol proportions were significantly increased by 10– 46%, and their high baseline levels predicted low reduction of serum cholesterol. The decrease of the scheduled stanol dose from 3 to 2 g/day after 6-month feeding increased serum cholesterol by 5% (P < 0.001) and serum plant sterol proportions by 8–13% (P < 0.001), but had no consistent effect on precursor sterols. In twelve subjects, the 12-month level of LDL cholesterol exceeded that of baseline; the non-cholesterol sterol proportions suggested that stimulated synthesis with relatively weak absorption inhibition contributed to the non-responsiveness of these subjects.

In conclusion, plant stanol ester feeding lowers serum cholesterol in about 88% of subjects, decreases the non-cholesterol sterols that reflect cholesterol absorption, increases the sterols that reflect cholesterol synthesis, but also slightly increases serum plant stanols. Low synthesis and high absorption efficiency of cholesterol results in the greatest benefit from stanol ester consumption.—Gylling, H., P. Puska, E. Vartiainen, and T. A. Miettinen. Serum sterols during stanol ester feeding in a mildly hypercholesterolemic population. J. Lipid Res. 1999. 40: 593–600.

Supplementary key words: cholesterol absorption, cholesterol malabsorption, cholesterol synthesis, non-cholesterol sterols, sitostanol, campestanol

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