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B. Green Tea and Cancer
I find no conclusive evidence that green tea aids in preventing or treating cancer. [Notice word conclusive.] When existing studies are reviewed, most do concluded that there is strong suggestive evidence of green teas does aid you against cancer. It did not though show a conclusive amount to a clear indications of benefit.
That being said, daily drinking of black tea (but not green tea) has been associated clearly associated with a significant reduction in death from all types of cancer.
Science has determined, some say it is limited evidence, that green tea consumption may be associated with a slightly lower risk of esophagus related cancers in Chinese people, a lower risk of lung cancer in women, and a lower risk of oral cancer in Asian people.
In 2015 studies concluded that large amounts of green tea consumption may lower the risk of liver cancer in Asian women.
This lower risk assessment did not extend to Asian men or when one cup of green tea was consumed daily.
Similarly, more research was done in 2012. This data suggested that green tea may diminish lung cancer risk. It should be noted that the effect was strongest in those who drank more than seven cups of green tea daily. Woe!
A 2011 epidemiological studies found some limited evidence that green tea ingested may run parallel to a moderately reduced risk of liver cancer in Chinese and Japanese people.
There is limited evidence indicating that green tea consumption is not associated with developmental risk regarding pancreatic cancer or prostate cancer.
The link between green tea consumption and stomach cancer risk was at best clouded by inconsistent evidence.
Green tea produces a negative drug interaction with the chemotherapy drug bortezomib (Velcade) and other boronic acid-based proteasome inhibitors. So if you choose a therapy that involve these lay off the green tea.