MERA Finest Fit Sterilised dry food is tailored to the specific needs of sterilised cats . Sterilisation changes the metabolic processes in the body, which often results in weight gain. Cats typically require a low-fat diet to prevent weight gain. The protein content of the food, on the other hand, should be high in order to maintain the muscles . In addition, a special combination of minerals can prevent the formation of urinary stones.