Arkansas Man Suffers Kidney Failure From Drinking Too Much Black Iced Tea

[From article]
They ruled out several potential causes before stumbling on a reason for the 56-year-old man's kidney problems. He said he drank about 16 8-ounce cups of iced tea every day. Black tea has a chemical known to cause kidney stones or even kidney failure in excessive amounts.
[. . .]
Doctors determined his kidneys were badly clogged and inflamed by the food chemical called oxalate. The man is on dialysis, perhaps for the rest of his life, Ghaffar said.
Besides black tea, oxalate is found in spinach, rhubarb, nuts, wheat bran and chocolate. In rare cases, too much oxalate can lead to kidney trouble, but often there's also a contributing intestinal problem.
[. . .]
At 16 cups of iced black tea each day, he was taking in three to 10 times more oxalate than the average American, Ghaffar and her colleagues reported.

http://www.foxnews.com/health/2015/04/02/arkansas-man-kidney-failures-stemmed-from-too-much-iced-tea/

Arkansas man's kidney failure stemmed from too much iced tea
Published April 02, 2015

Associated Press