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 Fish oil supplements are high in Omega-3 fatty acids, which have been linked to a reduced risk of cardiovascular disease and premature death. A well-controlled study from Appalachian State University casts some doubt on their beneficial effects in trained people. Fish oil supplementation decreased oxygen radical absorption capacity following intense exercise in trained cyclists. Oxygen radicals are highly reactive chemicals produced naturally during metabolism, which have been linked to destruction of cell membranes and DNA. This study used young, fit athletes, so the results may not apply to older, more sedentary people. (Medicine Science Sports and Exercise, 42: 1704-1711, 2010