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The British Medical Journal has published a Japanese study on the benefits of green tea consumption in preventing cardiovascular disease, liver disorders and possibly cancer. The study, begun in 1986, concerned 1371 men over the age of 40. Tea consumption was classified as less than 3 cups, between 4 and 9 cups, and over 10 cups per day. It was found that consumption of green tea was significantly associated with lower serum concentrations of lipids and lipoproteins. "An increase in consumption substantially decreased serum total cholesterol and triglyceride concentrations, and this strong association remained almost unaltered even after age, cigarette smoking, alcohol consumption and relative body weight were controlled for". Interestingly it was found that those who drank the most green tea (more than 10 cups) were also the heaviest smokers, but that whilst levels of lipid peroxides were generally higher among smokers than non-smokers, those smokers who drank more than 10 cups had lipid peroxide levels similar to non-smokers. The study also showed that consumption of green tea reduced liver cell damage and resulted in slightly lower (but not abnormal) haemoglobin concentration. The study also suggests that green tea has protective effects on the development of cancer.