Here's a study I found. Unable to find the original source. This is a cut and paste job for a nutritional forum I frequent.
"Green Tea Catechin Consumption Enhances Exercise-Induced Abdominal Fat Loss in Overweight and Obese Adults1,2
Kevin C. Maki3,*, Matthew S. Reeves3, Mildred Farmer4, Koichi Yasunaga5, Noboru Matsuo5, Yoshihisa Katsuragi5, Masanori Komikado5, Ichiro Tokimitsu5, Donna Wilder3, Franz Jones3, Jeffrey B. Blumberg6 and Yolanda Cartwright3
3 Provident Clinical Research, Bloomington, IN 47403 and Glen Ellyn, IL 60137; 4 Meridien Research, St Petersburg, FL 33709; 5 Health Care Food Research Laboratory, Kao Corporation, 131-8501 Tokyo, Japan; and 6 Antioxidants Research Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111
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."