Protein, phosphate, and minerals are very difficult for the kidney to filter, so prescription diets that restrict these substances place less strain on the organ. [substeps] Studies show that phosphate can also cause scar tissue to build up on the kidney, so it is doubly important to restrict phosphate in your cat's diet.
[header] How to care for a cat with kidney failure [title] Consider a prescription diet. [step] If your cat has kidney failure, talk to your veterinarian. He or she may prescribe a special renal diet that contains restricted amounts of high-quality protein and minimal amounts of phosphate and certain minerals.