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The effect of oral administration of taurine (3.2 g/day, 2 weeks) on the metabolism of lipids and bile acids was studied with healthy humans. Four male subjects were fed taurine. Another five male subjects were administered 1 g of cholesterol daily for two weeks and, at intervals of two weeks, cholesterol and taurine simultaneously. Serum lipoprotein and duodenal bile were analyzed. Oral administration of taurine resulted in the increase of taurine-conjugated bile acids. However, neither serum lipid nor biliary lipid composition was altered. Addition of taurine with cholesterol administration showed elevation of both the serum low density lipoprotein cholesterol level and the lithogenic index in bile. The ratio of glycine-to taurine-conjugated bile acids was changed from 4.1 to 0.63. The ratio of cholic acid/chenodeoxycholic acid was augmented from 0.57 to 0.81. The percentage of taurocholic acid, taurochenodexycholic acid and taurodeoxycholic acid were increased about 4-fold, 2.5-fold and 3-fold, respectively. Our results suggested that taurine administration alone did not influence the serum lipid level although taurine-conjugated bile acids were increased. The taurine intake would increase serum low density lipoprotein cholesterol and biliary cholesterol levels when excessive cholesterol is administered simultaneously.

Effect of taurine administration on serum lipid and biliary lipid composition in man.