Interesting question. We have forwarded your question to a tea expert who may be able to supply us with an answer on this one.
We also found a little bit of information that addresses why tea may be an issue in terms of kidney stones, but does not distinguish between hot and iced teas.
"Two large prospective studies found that the risk of developing symptomatic kidney stones decreased by 8% in women (61) and 14% in men (62) for each 8-ounce (235 mL) mug of tea consumed daily. A study in rats concluded that the antioxidants in green tea may be involved in inhibiting calcium oxalate precipitation and thus kidney stone formation (63). The implications of these findings for individuals with a previous history of calcium oxalate stone formation are unclear. High fluid intake, including tea intake, is generally considered the most effective and economical means of preventing kidney stones (64). However, tea consumption has been found to increase urinary oxalate levels in healthy individuals (65), and some experts continue to advise people with a history of calcium oxalate stones to limit tea consumption."
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Interesting question. We have forwarded your question to a tea expert who may be able to supply us with an answer on this one.
We also found a little bit of information that addresses why tea may be an issue in terms of kidney stones, but does not distinguish between hot and iced teas.
"Two large prospective studies found that the risk of developing symptomatic kidney stones decreased by 8% in women (61) and 14% in men (62) for each 8-ounce (235 mL) mug of tea consumed daily. A study in rats concluded that the antioxidants in green tea may be involved in inhibiting calcium oxalate precipitation and thus kidney stone formation (63). The implications of these findings for individuals with a previous history of calcium oxalate stone formation are unclear. High fluid intake, including tea intake, is generally considered the most effective and economical means of preventing kidney stones (64). However, tea consumption has been found to increase urinary oxalate levels in healthy individuals (65), and some experts continue to advise people with a history of calcium oxalate stones to limit tea consumption."
http://lpi.oregonstate.edu/infocenter/phytochemicals/tea/
Details to come.
July 28, 2008 - 10:14amThis Comment
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