Other green teas
Research and health effects
Main article: Health effects of tea
Green tea contains a variety of enzymes, amino acids, carbohydrates, lipids, sterols, polyphenols, carotenoids, tocopherols, vitamins, caffeine and related compounds, phytochemicals and dietary minerals. Numerous claims have been made for the health benefits of green tea based on chemical composition, in vitro and animal studies, though results in humans have been inconsistent and few clear benefits for humans have been demonstrated.[16] There is also evidence suggesting consuming large volumes of green tea, and in particularly green tea extracts, may cause oxidative stress and liver toxicity.[17]A 2012 systematic review concluded the evidence that green tea can prevent cancer "is inadequate and inconclusive" but with some evidence for a reduction in certain types of cancer (breast, prostate, ovarian and endometrial). Green tea may lower blood low-density lipoprotein and total cholesterol levels, though the studies were of short duration and it is not known if these effects result in fewer deaths and evidence does not support green tea reducing coronary artery disease risk. Several randomized controlled trials suggest green tea can reduce body fat by a small amount for a short time, though it is not certain if the reduction would be meaningful for most people.[18] One study has found that green tea may actually damage DNA.[19] Green tea is forbidden for people with Multiple Myeloma(MM) if they use the drug Bortezomib (Velcade)or similar
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