The Army is eager to know whether omega-3 fatty acids not only are good for the heart, but also might deter soldiers from killing themselves…Omega-3s are found naturally in foods such as fatty fish and walnuts and have been shown to help prevent heart disease. Preliminary studies suggest that the supplements could help relieve symptoms of certain depressions, the Mayo Clinic says. Experts note that fish oil's potential benefits for mental health need to be confirmed in larger, more rigorous studies.
USA Today, Gregg Zoroya, 9/21/11