Why was this study done?
Population studies have long shown a lower incidence of heart disease in cultures who consume a large portion of their diet as cold-water fish. These observations have led to the hypothesis that omega-3 fatty acids (EPA, DHA) might be responsible for the cardiovascular effects of these diets. This study was designed to investigate the relationship of differing doses of omega-3 fish oil (1, 3, 6 grams a day) on cardiovascular risk factors.
What did the study find?
The 1-gram/day dose did not alter EPA status significantly following 4 weeks of supplementation. The 3-gram/day dose was sufficient to alter EPA status, but only the 6-gram/day dose was able to significantly alter very low-density lipoproteins (VLDL) and triglycerides.