In a Taiwanese randomised controlled trial, 78 obese women who took 400mg of green tea extract three times a day for 12 weeks experienced significant reduction in LDL-cholesterol and triglyceride levels, and a simultaneous increase in levels of HDL-cholesterol, and the hormones adiponectin (promotes insulin sensitivity) and ghrelin (modulates hunger). (Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trial. Clin Nutr. 2008 Jun;27(3):363-70).