Hill's Prescription Diet Metabolic Chicken Flavor Dry Cat Food, 17.6-lb bag; Just like the human epidemic, almost 50% of the pet population is overweight. Even a little extra weight can impact the pet's quality of life and relationship with family because that extra weight can reduce play time, impact mobility and affect the lifelong general health of your cat. Hill's nutritionists and veterinarians developed Prescription Diet Metabolic clinical nutrition specially formulated to support your cat's weight management. In fact, 88% of pets lost weight at home in two months when fed the nutrition of Metabolic.