No matter how far science advances us, we always look to nature to inspire us. Purina ONE +Plus High Protein combines nature and research for results you can see in your cat. That includes a SmartBlend of high-quality ingredients, plus high protein and L-carnitine to help maintain a healthy weight and metabolism, and to support strong muscles including a healthy heart.See the results Purina ONE can make in your cat. Purina ONE Cat +Plus Tailored Formulas build on an already solid foundation, creating tailored pet food options that support specific needs like healthy weight, healthy aging, hairballs, and more. From energy and immune health to strong muscles, including a healthy heart, these high-quality formulas combine nature and research for results you can see in your cat.