A recent study, published in NEJM, a physician warned about the dangerous effects of black tea on kidney. Dr. Syed received a patient suffering from a renal failure, apparently caused by the accumulation of « Calcium oxalate crystals ».

Indeed, black tea seems to contain high levels of oxalate, that causes a high injury of kidneys in case of high consumption of black tea.

Drinking black tea daily causes the consumption of a daily average dose of 1500 mg of oxalate. That dose is 30 times higher than the normal recommended doses.

In addition, several food a star fruit, rhubarb and peanuts may cause the same injury because they contain same high levels of oxalate.

You could know more about the study, by clicking here.

Source: A case of Iced-Tea Nephropathy, Syed F et al. N Engl J Med. 2015 Apr 2;372(14):1377-1378.