Failing kidneys excrete phosphorus poorly, and rising blood phosphorus accelerates damage and metabolic disruption, making control an established part of management.
Renal prescription diets manage phosphorus levels and protein quality, with stage-specific formulations chosen by the vet from bloodwork.
A common mistake is homemade low-phosphorus meals of lean meat and water that underdeliver protein and calories, speeding muscle loss; phosphate binders also require prescriptions.
Treats and pastes can quietly raise phosphorus intake, so everything entering a kidney cat's mouth belongs on the vet's approved list.
