Hill's Science Diet Adult Indoor cat food provides precisely balanced nutrition for cats with an indoor lifestyle. It has fewer calories than the Science Diet Original formula to help maintain a healthy weight and a unique fibre technology to help avoid hairballs in just 30 days. It also has clinically proven antioxidants to support a healthy immune system for your cat keeping your feline friend happy and healthy. Helpful Tips - Adjust feeding amounts as necessary to maintain optimal weight. If you are unsure ; ask your veterinarian. - New to this food Mix increasing amounts of your pet's new food with decreasing amounts of the old food over a 7-day period. - Keep fresh water available at all times!