A number of studies have shown green and black teas exert anticholesterolemic effect [3– 6]. Epidemiological
studies found consumption of green or black tea drink was inversely correlated with plasma cholesterol concentrations [3,4]. Maramatsu et al. [5] suggests that addition of 1–2% green tea extract to the lard/cholesterol diet reduced blood cholesterol levels in rats. When EGCG was added to the same diet, it exerted similar effects as green tea extract [6]. Therefore, catechins are probably the active ingredient of green tea. However, the biological effect of oolong tea remains unclear. Yen and Chen [7] compared the antimuta- genic role of green, oolong and black teas and suggest oolong tea exerted the strongest effect. Therefore, it would be interesting to know how different types of tea modulate lipid metabolism.