The American Heart Association(AHA) recommends eating fish two to four times per week. However, even those who eat fish several times a week may not be getting enough omega-3. Farm raised fish have diminished amounts of EPA and DHA.
In addition, utilization of omega-3 can be reduced by low intake of certain vitamins and minerals, some prescription drugs, high intake of omega-6 acids and alcohol consumption. Individuals with certain medical conditions often need significantly more EPA & DHA that can reasonable be obtained by eating fish. Thus, fish oil supplements are recommended by medical professionals and organizations to ensure adequate omega-3 intake.