A while back we learned that soda, both diet and regular, was bad for the heart, and now it looks like more organs are at risk: the kidneys. This time it's diet sodas, or more specifically, the artificial sweeteners, that seem to be the culprit. A study published recently of over 3,500 women found that those who drank two or more diet sodas daily had decreased kidney function by about 30 percent. This percentage is significant, for at the beginning of the six-year study, the participants all had normal kidney function. Drinking two servings or fewer of diet soda daily did not decrease kidney function, which does naturally slow down with age. It looks like that diet soda, along with most other things, should be enjoyed in moderation.