Fish is a low-fat source of protein and white-fleshed fish is exceptionally low in fat. Fish is a good source of Omega-3 fatty acids, which aids cardiovascular health. We do not produce omega-3 fatty acids, so we must get them through the food we eat. Fish is considered a heart healthy food because it is packed with protein, vitamins and nutrients that can lower blood pressure and reduce the risk of heart attack or stroke.  It may boost brain function and reduce mental decline.