Evaluating the Effects of Omega-3 Fatty Acids on Heart Disease and Behavior

Inclusion Criteria: * Currently employed at least 25 hours a week, but does not regularly work the third shift (i.e., night shift) * English is primary language * Consumes less than 300 mg/day of long-chain omega-3 fatty acids. Exclusion Criteria: * Serious allergy to fish (e.g., anaphylaxis, bronchospasm, serious skin reaction) * History of atherosclerotic disease (e.g., myocardial infarction) or treatment of angina or claudication (e.g., angioplasty) * Reported history of schizophrenia or bipolar disorder * Long-term hepatitis * Kidney failure * Stroke or other neurological disorder * Lung disease requiring drug treatment * Stage 2 high blood pressure, defined as systolic blood pressure of 160 mm Hg or greater and diastolic blood pressure of 100 mm Hg or greater * Alcohol consumption of more than five drinks per day each week (i.e., more than 35 alcoholic drinks each week) * Pregnant or breastfeeding * Currently taking any cardiovascular, psychotropic, glucocorticoid, lipid-lowering, insulin, or weight loss medications * Currently taking fish oil supplements