Purina Veterinary Diets OM Canned Cat Food is a delicious, nutritious, and lean cat food formulated for cats on a weight-loss program. Purina Overweight Management Cat Food is low in fat and carbohydrates, and contains boosted fiber to promote fullness after each meal. Plus, Purina OM Canned Cat Fod contains boosted protein to increase fat-burning metabolism in your pet.