I have a coworker who says that drinking soda leads to kidney problems. I did some Googling and while I found a lot of blogs and message board posts saying such, the only credible link I found was this paper, Carbonated beverages and chronic kidney disease, whose abstract reads:
Drinking 2 or more colas per day was associated with increased risk of chronic kidney disease. Results were the same for regular colas and artificially sweetened colas. Noncola carbonated beverages were not associated with chronic kidney disease. These preliminary results suggest that cola consumption may increase the risk of chronic kidney disease.
I can't read the entire paper, but the abstract makes it sound as if the risk lies more in cola consumption than carbonated water consumption.
Is there a scientific consensus on the risks posed by consumption of carbonated water?