The Royal Canin Sterilised Cat Food is specially for neutered cats (from 1 to 7 years old). 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. Key Features: Weight Management - Limits the risk of excess weight gain after neutering through a moderate level of fat and adequate daily rations. Urinary Health - Contains a combination of minerals that help maintain your adult cat's urinary system. High Protein Content - Maintains muscle mass thanks to a high protein content. L-carnitine - Nutrition formulated to support fat metabolism.