Sodium is found in many processed foods. It helps regulate fluid levels in your body. Too much sodium can cause you to retain fluid and elevate blood pressure.
Potassium is found in some fruits, vegetables and beans. When your kidneys are not operating at 100%, dangerous levels of potassium can build up in your body. This can cause your heart to have an irregular rhythm or even stop beating. Dialysis removes excess potassium from your body, but it is important to limit your intake.
Phosphorus is a mineral found in many foods. Your kidneys remove phosphorus, but when they are malfunctioning, a build up can cause bones to become weak, muscles to ache, and heart, skin and blood vessels to calcify.