Therapeutic use of omega-3 fatty acids in bipolar disorder.

Why omega-3 fatty acids became a candidate for bipolar-disorder research

Omega-3 fatty acids are components of cell membranes and participate in processes important to brain function. This 2011 review examined whether those biological roles could help explain an effect on mood and whether the clinical evidence supported their use alongside established treatments for bipolar disorder.

Connecting nutrition with brain mechanisms. The article brings together animal studies of omega-3 deficiency and human studies of mood disorders. Experimental work suggested effects on stress responses, behavior and chemical messenger systems, including dopamine. The review also examines BDNF, a protein involved in nerve-cell survival and plasticity, as a possible link between omega-3 availability and the brain changes relevant to mood.

These mechanisms provide a rationale for clinical investigation, but a plausible biological pathway does not by itself demonstrate an effective treatment. The authors therefore considered clinical trial evidence separately from the laboratory findings.

The therapeutic question was specific. At the time of publication, the evidence was more encouraging for omega-3 fatty acids as an additional treatment for depressive symptoms than for establishing them as a general mood stabilizer. Bipolar disorder includes different mood states and requires attention to recurrence and stability over time, so an effect on depression alone does not answer all of those questions.

The review called for larger, well-controlled trials to establish clinical usefulness and to clarify the proposed molecular pathways. Its contribution is the integration of a nutritional mechanism with a clinical research question, particularly the possible relationship between omega-3 fatty acids and BDNF.

This is an account of the evidence assessed in 2011. It should be read as part of the development of the field, rather than as a current treatment guideline or a recommendation to replace established care with supplements.