Green tea is made from unfermented leaves of Camellia sinensis that have undergone a minimal oxidation during processing, pale in colour and slightly bitter in flavour. Green tea originated and mainly produced in China and Japan, but it has become associated with many cultures throughout Asia. Green tea has recently become relatively widespread in the West as well. Numerous scientific and medical studies determine the extent of its long-purported health benefits, with some evidence suggesting that regular green tea drinkers may have a lower risk of developing heart diseases and certain types of cancer. Although green tea does not raise the metabolic rate enough to produce immediate weight loss, a green tea extract containing polyphenols and caffeine has been shown to induce thermogenesis and stimulate fat oxidation, boosting the metabolic rate 4% without increasing the heart rate.
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