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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.
Nonetheless, tea, specifically black tea, is quite high in oxalates, which are responsible for most kidney stones. One suggestion is to be sure that the tea is either Green, Oolong or herbal, thus decreasing the oxalate content. Another is to go British, and add an ounce or so of cow's milk to each cup of (hot) tea.