PURINA ONE Healthy Weight with IMMUNE DEFENCE PLUS+ has been specially formulated with beta glucans, vitamin C & E and omega 3 & 6 fatty acids. Working in parallel this blend helps support first line immune defence for your cat: Vitamin E & C are natural antioxidants that help prevent cell damageassociated with aging and poor health Omega 3 & 6 fatty acids helps keep skin healthy to maintain a strong barrierto the external environment Beta glucans to help support optimal immune response.PURINA ONE Healthy Weight Dry Cat Food with Chicken is formulated with adapted nutrient profile to maintain healthy body condition in cats who have a tendency to gain weight. Plant fibres, L-carnitine and high quality protein sources work in combination with reduced calories to help cats reach and maintain healthy weight.