Article : Tuna is truly an amazing food with a number of benefits that contribute to a healthy lifestyle. Tuna is rich in Omega-3 polyunsaturated fatty acids and has been known to reduce the risk of heart disease. It is also low in fat and cholesterol making it a great alternative to beef. Not only is tuna a powerhouse of nutrition, it is also one of the most delicious sources of lean protein that you will ever sink your teeth into. Fish.