Green teas are produced from leaves that are withered in the sun immediately after being hand-picked. Once the leaves become pliable, they are traditionally pan-fried in woks. You may want to try cutting down on the number of cups you drink per day, switching to another beverage after early afternoon and/or cutting down on the sugar you add to your coffee. There is increasing evidence that caffeine is not as much of a dietary culprit as experts previously thought. For example, some studies indicate caffeine intake may have a protective effect against Parkinson's disease as well as liver and colorectal cancers.The combination of green tea and chemotherapy medications, specifically doxorubicin and tamoxifen, increased the effectiveness of these medications in laboratory tests. However, these results have not yet been demonstrated in studies on people. On the other hand, there have been reports of both green and black tea extracts stimulating a gene in prostate cancer cells that may cause them to be less sensitive to chemotherapy drugs. Given this potential interaction, people should not drink black and green tea (as well as extracts of these teas) while receiving chemotherapy for prostate cancer in particular.The study determined that EGCG supplementation significantly reduced body weight gain, associated with increased fecal lipids and decreased blood glucose levels, compared to those of the control group.The study grouped the results from twenty past research bodies covering a total of 1,415 participants. Once compiled and analyzed, the pooled data found that green tea catechins, at doses ranging from 145 to 3,000 mg per day (including consumption as green tea beverage and extract in capsules), led to statistically significant reductions in total and LDL ("bad") cholesterol, compared to controls who did not consume any.Reporting in the research journal Obesity, researchers continue to mount crucial evidence to support green tea as an agent in the war against overweight and obesity. Green tea (and its less refined cousin, white tea) is shown to slow weight gain and may be a key tool in the obesity epidemic impacting the health of millions of children and adults in western cultures.A diet low in processed food is also key. Whenever possible, avoid eating foods that have been heavily refined and filled with chemical additives.