Black or Red teas are different from Green or Oolong teas because they undergo a full fermentation, which causes the leaves to turn black and gives the characteristic flavor. As with the Green and Oolong tea the leaves are withered immediately after picking. It has already been shown to prevent flu, improve heart health, and fight obesity, and now researchers at Western University of Health Sciences in California say green tea can also shave a few points off your "bad" cholesterol.Published in the Journal of the American Dietetic Association, the study pooled results of 20 clinical trials which included 1,415 adults. The trials, which lasted anywhere from three weeks to six months, used green tea in liquid or capsule form, in addition to placebos for control groups.Once again, whole ingredients offer more benefits than isolated compounds.Lambert noted "Our results suggest that if you supplement with EGCG or green tea you gain weight more slowly." Additionally, mice fed the green tea supplement showed a nearly 30 percent increase in lipid excretion, suggesting that the EGCG was limiting fat absorption by inhibiting pancreatic lipase.To design this research work, scientists handed out questionnaires to nearly 14,000 respondents aged 65 or older. The participants answered questions about general diet, green tea consumption and lifestyle.