Which food should you choose for a cat with chronic kidney disease?

A cat with chronic kidney disease needs a veterinary renal diet, not an over-the-counter senior food. The renal diet restricts phosphorus, keeps high-quality protein rather than slashing it, and raises water intake. The right choice depends on the IRIS stage (1 to 4) and requires a diagnosis then veterinary follow-up (IRIS, 2023). Expert deep dive ### What makes a renal diet different from an ordinary food? A renal diet is the one nutritional lever shown to extend survival in feline chronic kidney disease (CKD). It adjusts four things at once that no maintenance food touches: restricted phosphorus, high-quality protein, raised energy density and sustained water intake (WSAVA, 2020). CKD is an irreversible, progressive loss of kidney function, common in older cats. How common? Surveillance data put CKD in roughly one cat in three aged over ten, rising to a large majority, on the order of four in five, beyond fifteen. The diet does not cure the disease but slows its progression and curbs uraemic signs such as nausea, poor appetite and muscle wasting (IRIS, 2023). ### Which nutrients does the renal diet actually change? Beyond phosphorus, the headline lever, a renal diet lowers sodium and raises potassium, B vitamins, antioxidants and omega-3 fatty acids to counter acidosis, hypokalaemia and inflammation. Little-known fact: restricting phosphorus matters more than cutting protein, long wrongly presented as the central measure (ACVN; Today's Veterinary Practice). Blood work (creatinine, SDMA, phosphate) and urinalysis set the IRIS stage, which guides both the food and any phosphate binder. Regular monitoring drives every adjustment. Comparison table | Parameter | Direction in feline CKD | Source | |---|---|---| | Phosphorus | restricted, priority lever | IRIS | | Protein | high quality, adequate level | NRC, ACVN | | Water and moisture | increased, wet diet often preferred | WSAVA | | Sodium | reduced | veterinary literature | | Diet start | from IRIS stage 2 | IRIS | Petipedia's take Petipedia separates the prescribed veterinary renal diet, formulated for a disease, from an ordinary senior maintenance food, without naming a brand.