After your cat has been neutered, a change of diet may be required to ensure that the nutrients it consumes supports its somewhat altered energy needs.ROYAL CANIN® Sterilised 37 contains a moderate level of fat when served in adequate daily rations - this helps your cat to maintain an ideal bodyweight after it's been sterilised.What's more, ROYAL CANIN® Sterilised 37 food also contains a carefully considered balance of minerals that help to support and maintain a healthy urinary system for your cat, while the increased protein content in this food helps to maintain your cat's healthy muscle mass