Hill's Prescription Diet k/d Kidney Care Chicken & Vegetable Stew Canned Cat Food, 2.9-oz, case of 24; Kidneys are important because they remove waste substances from the blood, and maintain the normal balance of fluid and minerals within the body. Once kidney damage occurs, the consequences are usually irreversible. Hill's nutritionists and veterinarians developed Prescription Diet k/d, clinical nutrition especially formulated to support your cat's kidney health. In fact, k/d is clinically tested nutrition to improve and lengthen quality of life. This irresistible food makes it easier for you to bond with your pet with gently cooked, bite-sized chunks of real chicken and natural ingredients with added vitamins and minerals.