In a study published in the journal Epidemiology, the team compared the dietary habits of 465 people with chronic kidney disease and 467 healthy people. After controlling for various factors, the team found that drinking two or more colas a day — whether artificially sweetened or regular — was linked to a twofold risk of chronic kidney disease.
But drinking two or more noncola carbonated drinks a day, they found, did not increase the risk.
The authors of the study say more research is needed, but their findings support the long-held notion that something about cola — the phosphoric acid, for example, or the ability of cola to pull calcium from bones — seems to increase the risk of kidney stones, renal failure and other conditions affecting the kidneys.
Epidemiology. 18(4):501-506, July 2007.
Saldana, Tina M. *; Basso, Olga *; Darden, Rebecca +; Sandler, Dale P. *