Drink plenty of. Water, keep blood pressure under control.
Kidneys. It is very important to keep your blood pressure under control. If you have diabetes, blood sugar control is also imperative. Keeping your cholesterol controlled also can help prevent hardening of the arteries going to the kidneys. Keeping well hydrated is important. Avoiding or limiting the use of nsaids (ibuprofen, advil, naprosyn) can also help.