Just like us, what a cat eats at each stage of life has a powerful effect on their growth, strength and total well-being. That's why every product in the OPTIMUM Dry Cat range has been developed with high quality protein sources to ensure increased nutrient absorption and superior BIOAVAILABILTY. This means that high levels of nutrients are absorbed by their body so that your cat can get the most out of their food and more out of life. OPTIMUM Healthy Weight is specifically formulated with L-Carnitine to support healthy fat metabolism.