Because it contributes to your cats beauty and particularly his or her health its important to make sure that your pets ideal weight is maintained a protein and fibre rich diet with a moderate fat content supports the maintenance of a healthy weight royal canin pure feline slimness cat food contains delicate poultry as the only source of animal protein in the food poultry is an excellent source of essential amino acids and is high in protein 42 and low in fat 12 for an ideal protein