GIVE me tuna sandwich any time of the day and I will be good to go. Last week I had a difficult time explaining to someone why I love eating any food made out of tuna fish.Tuna is an incredibly nutrient-dense food. It is rich in high quality protein and an excellent source of important nutrients such as the minerals selenium, magnesium, and potassium; not to mention the B vitamin complex, and of course, the marvelous omega-3 essential fatty acids.I could not have put it any better than what the net provided for me.Good for the heartResearch has shown that tuna fish is rich in omega 3, a healthy substance that can maintain cardiac function.  As much as fat is not so good in the body, in the case of omega 3, the ratio increases the concentration of good cholesterol in the body. It also suppresses the occurrence of blood clots in blood vessels, and keeps the rhythm of the heartbeat.EyesWe all know that when we were young our mothers always told us to eat carrots so that we can maintain good eyesight. Well, research has proved that Omega-3 is also good for the eyes as it prevents the body in the eye against mascular degeneration, a condition in which vision deteriorates the impact on vision loss when aged over 50 years. Prevent CancerCancer has become number one killer in the world. As I write a friend of mine is undergoing chemotherapy for stomach cancer. Omega 3 which is found in tuna is said to prevent some cancers like cancer of the breast, ovarian cancer, pancreatic cancer and the other types of cancers that attack the digestive tract e.g cancer of the mouth, pharynx, esophagus, stomach, and intestines. It can also reduce the risk of childhood leukemia.Increasing brain cognitive functionThere is a myth that communities which come from the lakeside and feed on fish have very good brains. I am not so sure about this, but studies show that Omega-3 helps improve cognitive function or functions of the brain to remember, and helps keep away diseases such as Alzheimer’s.  People, who suffer from this disease, usually experience the disruption in the delivery of signals or impulses to the brain. This is where omega 3 comes in by facilitating blood supply to the brain and reduces the risk of inflammation.Maintaining stability of moodEat lots of tuna and experience less mood swings. Do you know the reason why? EPA in omega-3 helps increase blood flow and affects the hormonal and immune system, which has a crucial function for the brain. DHA-omega-3 acids are then used as an iron channel in the brain that helps the transmission signal, and the metabolic role in serotonin-a major factor in depression and stress.Increasing Insulin hormone responseTuna is also recommended to be consumed for those who suffer from type-2 diabetes, because of the content of omega-3 fats. Studies suggest, though saturated fats cause and trigger obesity, type of fat in tuna-fish omega-3 has an opposite role; it prevents you from obesity and improve insulin response in the body. Omega-3 fatty acids known as EPA help regulate body weight and body metabolism by secreting the hormone leptin.Assist the detoxification processWhen you hear of detoxification, we think of green tea and other herbs; who knew that we could get the same service by eating the delicious tuna fish? Selenium along with omega-3 contained in the tuna, is an important fuel for the production of gluthathione peroxidase-type antioxidants. This is an antioxidant essential for healthy liver function, whose role is to detoxify leaving one feeling fresh and healthy.It does not matter how you eat your tuna, whether as a whole fish, in sandwich or in salad – just choose what you like and have it. Make a habit of including lots of tuna in your diet so that you can prevent these lifestyle diseases; and live a healthier lifestyle.