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Studies that explore the benefits of green tea show conflicting evidence about exactly how much you should drink each day.
Some studies show health benefits in people who drink as little as one cup per day, while other studies deem five or more cups per day to be optimal (15, 16Trusted Source).
Green tea may help lower the risk of several diseases. However, the optimal amount to drink may depend on the disease.
1.Oral cancer: In a large observational study, women who drank three to four cups of green tea daily were the least likely to develop oral cancer (17Trusted Source).
2.Prostate cancer: A large observational study found that men who drank five or more cups of green tea daily had a lower risk of developing prostate cancer, compared to those who drank less than one cup per day (18Trusted Source).
3.Stomach cancer: Another large observational study showed a reduced risk of stomach cancer in women who consumed five or more cups of green tea per day (19Trusted Source).
4.Breast cancer: Two observational studies showed reduced recurrences of breast cancer in women who drank more than three cups of green tea daily (20Trusted Source, 21Trusted Source).
5.Pancreatic cancer: One observational study found that drinking five or more cups of green tea per day was linked to a decreased risk of pancreatic cancer (22Trusted Source).
6.Diabetes: In a retrospective observational study, people who consumed six or more cups of green tea daily had a 33% lower risk of developing type 2 diabetes, compared to those who consumed less than one cup per week (23Trusted Source).
7.Heart disease: An analysis of nine studies found that people who consumed one to three cups of green tea daily had a lower risk of heart attack and stroke, compared to those who drank less than one cup (24Trusted Source).
Based on the above studies, it’s optimal to drink three to five cups of green tea per day.
However, it's important to note that some studies did not find any association between drinking green tea and disease risk, so these effects may vary from person to person (25Trusted Source, 26Trusted Source).
One thing most studies have found is that green tea drinkers are in better health than those who do not drink tea at all.