Mixed

Increasing dietary intake of marine n-3 fatty acids or fish consumption from low levels (1 serving/month) to high levels (6+ servings/week) does not substantially reduce the risk of coronary heart disease in men without preexisting cardiovascular disease.

If you are a healthy man, eating more fish (up to 6 servings a week) or increasing your marine n-3 fatty acid intake is unlikely to significantly lower your risk of coronary heart disease. While fish is part of a healthy diet, this study suggests that dietary amounts are insufficient to provide the protective cardiovascular effects often attributed to fish oil supplements, which require much higher doses.