The kidneys filter waste and toxins from the blood and maintain the normal balance of fluid and minerals within the body. As pets age, damage to kidney tissues may occur. This process is irreversible and leads to loss of kidney function. Cats with decreased kidney function may experience loss of appetite and their food intake might decline, which may lead to loss of muscle mass. Hill's nutritionists and veterinarians developed Prescription Diet® k/d® clinical nutrition to support your cat's kidney function and help sustain muscle mass. In fact, the nutrition of k/d is clinically tested nutrition to improve & lengthen quality of life. •Protects vital kidney & heart function •Supports the cat's natural ability to build muscle mass daily •Stimulates appetite & increases caloric intake INGREDIENTS: Brewers Rice, Whole Grain Wheat, Ocean Fish, Corn Gluten Meal, Pork Fat, Wheat Gluten, Egg Product, Chicken Liver Flavor, Flaxseed, Dried Beet Pulp, Fish Oil, Soybean Oil, Calcium Sulfate, Lactic Acid, Potassium Citrate, Calcium Carbonate, L-Lysine, DL-Methionine, Choline Chloride, Taurine, Potassium Chloride, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Vitamin A Supplement, Calcium Pantothenate, Riboflavin Supplement, Biotin, Vitamin B12 Supplement, Pyridoxine Hydrochloride, Folic Acid, Vitamin D3 Supplement), minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), Iodized Salt, L-Tryptophan, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene. Nutrient Dry Matter% Protein 29.3 % Fat 22.5 % Carbohydrate / NFE 39.6 % Crude Fiber 3.1 % Calcium 0.79 % Phosphorus 0.51 % Potassium 0.74 % Sodium 0.26 % Magnesium 0.074 % Taurine 0.27 % Vitamin C 104 ppm Vitamin E 815 IU/kg Total Omega-3 FA 1.01 % Carnitine 583.5 ppm *The nutrient in the product after moisture is removed. It is used to make direct comparisons of nutrient profiles with differing moisture contents. 4084 kcal/kg (498 kcal/cup) (An eight fluid oz. measuring cup of k/d with Ocean Fish Cat Food contains 4.3 oz. by weight.)