Some cats can be more prone to gain weight than others. Even a little extra weight can impact the pets 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. Weight problems can be successfully managed through changes in your cat's food.Hill's nutritionists & veterinarians developed Prescription Diet® w/d® clinical nutrition especially formulated to support your cat's weight management. In fact, w/d is clinically tested nutrition for conditions that respond to fiber.