Fish is a great source of high quality of animal protein and healthy fat. Some fatty fishes like salmon, eels, tuna, etc are rich in omega 3 polyunsaturated fatty acids, which have been shown to reduce inflammation and lower the risk of heart disease and stroke. The American Heart Association recommends eating 2 servings of fish (particularly fatty fish) per week. A study published by American physiological Society suggests that fatty fish oils can also protect the heart during the time of mental stress.