Too much iced tea?

Oxalates are contained in many foods including spinach. Too many oxalates may cause kidney stones, or before that, very very painful urination as those calcium oxalate crystals come "down the tube." As the weather heats up, something to keep in mind. From Newswise, the journalists'-only site:
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Newswise — Do you quench your summer thirst by drinking lots of ice tea? The dehydration that summer frequently brings combined with swilling too much ice tea increases your risk of kidney stones, says James Cummings, M.D., professor of urology at Saint Louis University. Ice tea contains the chemical oxalate, which is the key culprit in the formation of kidney stones, a painful and common disorder of the urinary tract. Cummings is available to talk about ways to prevent kidney stones.