The food your cat eats plays an important role in his or her overall health and well-being. As cats age, they require different levels of nutrients to reduce excesses that could be harmful to their system. Factors such as age or weight may affect heart function leading to lifestyle and mood changes. Kidneys remove waste substances from the blood and maintain the normal balance of fluid and minerals within the body. Once kidney damage occurs, the consequences are usually irreversible. Hill’s nutritionists and veterinarians developed nutrition to support your older cat’s kidneys and heart for overall health. Hill’s® Prescription Diet® g/d® Feline is a complete and balanced food that provides all the nutrition cats need.