There was an interesting post - er article - in the New York Times today about a link between drinking cola (diet or sugary) and kidney problems.
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.
Good thing I don't drink that stuff anymore...