Over 1.2 million others have accepted the 28-Day Challenge to see a difference in their pet, from healthy energy to bright eyes and strong, healthy teeth and gums. Purina ONE provides 100% nutrition and 0% fillers, our recipes are natural with vitamins, minerals, and nutrients to support your cat's whole-body health from grain-free, moisture-rich wet recipes that promote healthy hydration to formulas with added fiber to minimize hairballs. there's a Purina ONE variety to meet the unique nutritional needs of cats throughout their lives, from kitten to senior. Protein-Rich Meals Made with Real Meat, Poultry, or Fish We craft our protein-rich, Purina ONE cat food formulas with real meat, poultry, or fish to help maintain your cats strong, lean muscles and give her the meaty taste she loves.