The kidneys primary role is to purify the blood by removing waste products from it. The kidneys also are the primary organ which rid the body of excess water, minerals, and chemicals. They regulate the amounts of water and vital minerals in the body like: sodium, potassium, calcium, phosphorous, and bicarbonate as well.
Patients with chronic kidney disease often times experience dysfunctioning in terms of the regulation of fluid and electrolytes in their bodies because their kidneys are not functioning properly. They can experience severe imbalances in terms of the natural distribution of fluid and electrolytes in their body even if they only drink the recommended daily amounts of water for a normal person, or consume foods with the amount of salt of potassium needed for a normal person. They need to follow a modified diet as prescribed by their doctor or dietician for this reason.