Low dietary protein only decreases the symptoms associated with severe end-stage kidney failure. If your cat has kidney disease it may become ill on a diet thats high in protein or a diet based on poor-quality protein. Poesen et al.
The recommended range of protein on a dry matter basis for cats with CKD is 28-35. Low dietary protein only decreases the symptoms associated with severe end-stage kidney failure. So a cat with kidney disease can consume more protein than its body can handle. Low phosphorus less than 059 is best.