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: Chicken, Brown Rice, Corn Protein Meal, Chicken Fat, Brewers Rice, Whole Grain Wheat, Pea Protein, Egg Product, Chicken Liver Flavor, Powdered Cellulose, Fish Oil, Lactic Acid, Calcium Sulfate, Soybean Oil, L-Threonine, Potassium Citrate, L-Arginine, L-Lysine, Betaine, Calcium Carbonate, Whole Grain Oats, Choline Chloride, DL-Methionine, Fructooligosaccharides (FOS), Potassium Chloride, vitamins (Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Vitamin C), Niacin Supplement, Thiamine Mononitrate, Pyridoxine Hydrochloride, Calcium Pantothenate, Riboflavin Supplement, Vitamin A Supplement, Biotin, Vitamin B12 Supplement, Folic Acid, Vitamin D3 Supplement), Taurine, Iodized Salt, minerals (Ferrous Sulfate, Zinc Oxide, Copper Sulfate, Manganous Oxide, Calcium Iodate, Sodium Selenite), L-Carnitine, L-Tryptophan, Mixed Tocopherols for freshness, Natural Flavors, Beta-Carotene. Nutrient Dry Matter% Protein 28.9 % Fat 23 % Carbohydrate / NFE 39.4 % Crude Fiber 3.1 % Calcium 0.83 % Phosphorus 0.54 % Potassium 0.74 % Sodium 0.26 % Magnesium 0.078 % Taurine 0.25 % Vitamin C 115 ppm Vitamin E 788 IU/kg Total Omega-3 FA 0.93 % Carnitine 601.7 ppm *The nutrient in the product after moisture is removed. It is used to make direct comparisons of nutrient profiles with differing moisture contents. 4083 kcal/kg (521 kcal/cup)(An eight fluid oz. measuring cup of k/d with Chicken Cat Food contains 4.5 oz. by weight.)