Background: Oolong tea has been studied for its effect on cardiovascular disease and obesity. Plasma adiponectin levels are reduced in obesity, in patients with type 2 diabetes mellitus and in coronary artery disease (CAD). Objective: To investigate prospectively, whether intake of Oolong tea influences plasma adiponectin levels, low-density lipoprotein (LDL) particle size, total cholesterol, high-density lipoprotein (HDL) cholesterol, LDL cholesterol, serum triglyceride and plasma glucose levels in patients with CAD. Methods: Twenty two patients in our study consumed Oolong tea (1000 ml) or water for 1 month in our randomized cross-over study design. Results: There was a significant difference in plasma adiponectin levels before and after 1 month intake of Oolong tea (6.26±3.26 μg/ml versus 6.88±3.28 μg/ml, P<0.05), and in plasma level LDL particle size (25.02±0.67 nm versus 25.31±0.60 nm, P<0.01). The water-consuming control group showed no changes (6.28±3.28 μg/ml versus 6.23±3.21 μg/ml) in adiponectin levels or LDL particle sizes (25.03±0.70 nm versus 25.02±0.72 nm). We also observed a significant difference in hemoglobin A1c levels (7.23±4.45% versus 6.99±4.30%, P<0.05) before and after intake of Oolong tea. Conclusion: Oolong tea may have beneficial effects on the progression of atherosclerosis in patients with CAD.
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Published online: August 19, 2004
Accepted: January 21, 2004
Received in revised form: January 15, 2004
© 2004 Elsevier Ireland Ltd. Published by Elsevier Inc. All rights reserved.