Just as humans have a Recommended Daily Allowance (RDA) of nutrients to stay healthy, pets have an RDA* too. That's why Science Diet?products are the first and only pet food with Advanced RDA System?nutrition. This approach delivers an unsurpassed nutritional balance of protein, fat, vitamins and minerals to help keep your pet healthy. Most cats one through six years old should be fed Feline Maintenance?brand cat food. It's specifically formulated with low magnesium and proper protein, vitamin and mineral levels to promote a healthy skin and coat; bright, clear eyes; strong muscles, bones and teeth; and health and vitality - all signs of your cat's good health. And, Feline Maintenance?is highly digestible. That means maximum nutritional benefits from each feeding with reduced feeding costs and less stool clean-up.