A sucrose-rich diet (SRD) has been proven lipogenic[8,9]. It induces hypertriglyceridemia and elevates triglyc-eride (TG) content in the liver and the heart as soon as three weeks in rats [8,9]. Long-term feeding with SRD results in a steady state of hypertriglyceridemia and hyperglycemia [9]. Although green tea extract has been shown to suppress hyper-cholesterolemia induced by high fat/cholesterol diet,
it is unclear how tea extracts prepared from green, oolong and black teas modulate TG metabolism in rats fed SRD. Therefore, the present study was undertaken to characterize the onset of modulatory effects of ethanol-soluble fractions of green, oolong and black teas on lipid metabolism and to examine the mechanisms by which tea may exert the anti-hyperlipidemic effects. In this study, catechin composition from green, oolong and black tea extracts that were extracted by ethanol, were determined. Effects of tea drink on plasma TG as well as total and HDL-cholesterol concentra-tions were determined on different time points (d 18 and 25). We also compared effects of tea extracts on TG and cholesterol contents in the liver and in the heart. Finally, we
examined if tea extracts modulated energy retention by protein absorption, and affected lipid metabolism by appar-ent fat absorption and fecal bile acid excretion.
A sucrose-rich diet (SRD) has been proven lipogenic[8,9]. It induces hypertriglyceridemia and elevates triglyc-eride (TG) content in the liver and the heart as soon as three weeks in rats [8,9]. Long-term feeding with SRD results in a steady state of hypertriglyceridemia and hyperglycemia [9]. Although green tea extract has been shown to suppress hyper-cholesterolemia induced by high fat/cholesterol diet,
it is unclear how tea extracts prepared from green, oolong and black teas modulate TG metabolism in rats fed SRD. Therefore, the present study was undertaken to characterize the onset of modulatory effects of ethanol-soluble fractions of green, oolong and black teas on lipid metabolism and to examine the mechanisms by which tea may exert the anti-hyperlipidemic effects. In this study, catechin composition from green, oolong and black tea extracts that were extracted by ethanol, were determined. Effects of tea drink on plasma TG as well as total and HDL-cholesterol concentra-tions were determined on different time points (d 18 and 25). We also compared effects of tea extracts on TG and cholesterol contents in the liver and in the heart. Finally, we
examined if tea extracts modulated energy retention by protein absorption, and affected lipid metabolism by appar-ent fat absorption and fecal bile acid excretion.
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