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Green tea has a lot of benefits to those that have kidney diseases. Green tea can improve kidney filtration function so as to promote urination and at the same time discharge more wasteful products out of the kidneys and bloodstream.
Green tea can be harmful in large quantities. Green tea is good for you, but only if drunk in moderation. While the polyphenols in green tea are credited with preventing heart disease and cancer, it seems they can cause liver and kidney damage if consumed in very large quantities, a review of studies into the toxicity of polyphenols has shown.