Journal of Nutrition, Vol. 139, No. 2, 264-270, February 2009
Green Tea Catechin Consumption Enhances Exercise-Induced Abdominal Fat Loss in Overweight and Obese Adults
This study evaluated the influence of a green tea catechin beverage on body composition and fat distribution in overweight and obese adults during exercise-induced weight loss. Participants (n = 132 with 107 completers) were randomly assigned to receive a beverage containing ~625 mg of catechins with 39 mg caffeine or a control beverage (39 mg caffeine, no catechins) for 12 wk. Participants were asked to maintain constant energy intake and engage in ≥180 min/wk moderate intensity exercise, including ≥3 supervised sessions per week. Body composition (dual X-ray absorptiometry), abdominal fat areas (computed tomography), and clinical laboratory tests were measured at baseline and wk 12. There was a trend (P = 0.079) toward greater loss of body weight in the catechin group compared with the control group; least squares mean (95% CI) changes, adjusted for baseline value, age, and sex, were ?2.2 (?3.1, ?1.3) and ?1.0 (?1.9, ?0.1) kg, respectively. Percentage changes in fat mass did not differ between the catechin [5.2 (?7.0, ?3.4)] and control groups [?3.5 (?5.4, 1.6)] (P = 0.208). However, percentage changes in total abdominal fat area [?7.7 (?11.7, ?3.8) vs. ?0.3 (?4.4, 3.9); P = 0.013], subcutaneous abdominal fat area [?6.2 (?10.2, ?2.2) vs. 0.8 (?3.3, 4.9); P = 0.019], and fasting serum triglycerides (TG) [?11.2 (?18.8, ?3.6) vs. 1.9 (?5.9, 9.7); P = 0.023] were greater in the catechin group. These findings suggest that green tea catechin consumption enhances exercise-induced changes in abdominal fat and serum TG.
http://jn.nutrition.org/cgi/content/abstract/139/2/264
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