This study was conducted to investigate the prevalence of obesity and the concerns with omega 3 fatty acid intakes in 100 men do regular exercising. Most subjects were 23~66 years old whose average height and weight were 170.0$pm$0.5cm and 68.2$pm$0.8kg, respectively. Prevalence of obesity was 7%, 41% and 41% by criteria of Bioelectrical impedance analysis, Skin fold thickness and Body mass index, respectively. According to this survey, 75% of the subjects prefered vegetable oil to animal fat, 55% of them prefered seaweeds to shellfishes and 76% of them prefered natural foods to processed foods for good health. 61% of the interviewed subjects had the experience of eating perilla oil and 49% of them chose the Mackeral that had contained omega 3 fatty acids. The reason that seaweeds were good for health was rather high vitamin and mineral content than low fat.