Smartheart Can Tuna in Jelly 400gm SmartHeart canned cat food is a delicious meal providing 100% of all essential nutrients that cats need to stay healthy and strong. Complete & Balanced Nutrition.Protein: Quality meat to provide amino acids to maintain good muscle mass.Fat: For energy and source of essential fatty acids to maintain healthy skin and shiny coat. Vitamins: For body functions and enhancement of the immune system.