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DSM Nutritional Products Ltd, Department of Human Nutrition and Health, CH-4002 Basel, SWITZERLAND
Address reprint requests to: Dr. Swen Wolfram, DSM Nutritional Products Ltd, Department of Human Nutrition and Health, P.O. Box 3255, Bldg. 241/425, CH-4002 Basel, SWITZERLAND
Since ancient times green tea has been considered a health-promoting beverage. In recent years, scientists throughout the world have investigated the potential benefits of green tea and its most abundant catechin, epigallocatechin gallate (EGCG). The anti-cancer effects of green tea and EGCG were the focus of early research, and encouraging data from in vitro, animal model, and human studies have emerged. Due to the dominant role of cardiovascular disease and the dramatic rise of obesity and type 2 diabetes mellitus as major and interlinked healthcare problems, green tea and EGCG are increasingly being investigated in these areas. Dose-response relationships observed in several epidemiological studies have indicated that pronounced cardiovascular and metabolic health benefits can be obtained by regular consumption of 5–6 or more cups of green tea per day. Furthermore, intervention studies using similar amounts of green tea, containing 200–300 mg of EGCG, have demonstrated its usefulness for maintaining cardiovascular and metabolic health. Additionally, there are numerous in vivo studies demonstrating that green tea and EGCG exert cardiovascular and metabolic benefits in these model systems. Therefore, green tea and EGCG can be regarded as food components useful for the maintenance of cardiovascular and metabolic health. To prove the effectiveness for disease prevention or treatment, several multi-center, long-term clinical studies investigating the effects of one precisely-defined green tea product on cardiovascular and metabolic endpoints would be necessary. The aim of this manuscript is to provide an overview of the research investigating the effects of green tea and green tea catechins on cardiovascular and metabolic health.
Key words: epigallocatechin gallate, green tea, metabolic syndrome, diabetes, obesity, hypertension, cholesterol
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