Healthy kidneys also help keep your bones healthy. They do this in two ways:

  • Your kidneys keep the right amounts of phosphorus and calcium in your body. When your kidneys are not working well, too much phosphorus can build up in your blood. This is called hyperphosphatemia.
  • Your kidneys also help your body use vitamin D. When your kidneys are not working, your body may not be able to use vitamin D like it should. This can also cause your bones to get weak.

Too much phosphorus or not enough vitamin D in your blood puts you out of balance. Your body tries to "fix" this using a hormone called parathyroid hormone (PTH). PTH pulls calcium from your bones to try and put your blood back in balance. This loss of calcium can eventually cause bone disease.