The kidneys may be called the Rodney Dangerfield of the body, as they often "don't get no respect." The National Kidney Foundation estimates that one in three adult Americans are at risk for kidney disease, yet these organs are mostly ignored unless they develop stones or stop working.

When healthy, kidneys work continuously at their main job of filtering blood to remove unwanted products and help produce urine. Kidneys clean approximately 200 liters of blood each day, removing up to two liters of toxins, waste and water in the process. Perhaps less well known is the fact that the kidneys are...