Food and Behaviour Research

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Fat food for a bad mood. Could we treat and prevent depression in Type 2 diabetes by means of omega-3 polyunsaturated fatty acids? A review of the evidence.

Pouwer F, Nijpels G, Beekman AT, Dekker JM, Dam RM, Heine RJ, Snoek FJ. (2005) Diabet Med. 22(11) 1465-75. 

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Aims: Evidence strongly suggests that depression is a common complication of Type 2 diabetes mellitus. However, there is considerable room to improve the effectiveness of pharmacological antidepressant agents, as in only 50-60% of the depressed subjects with diabetes does pharmacotherapy lead to remission of depression. The aim of the present paper was to review whether polyunsaturated fatty acids (PUFA) of the omega-3 family could be used for the prevention and treatment of depression in Type 2 diabetes. Methods: MEDLINE database and published reference lists were used to identify studies that examined the associations between omega-3 PUFA and depression. To examine potential side-effects, such as on glycaemic control, studies regarding the use of omega-3 supplements in Type 2 diabetes were also reviewed. Results: Epidemiological and clinical studies suggest that a high intake of omega-3 PUFA protects against the development of depression. There is also some evidence that a low intake of omega-3 is associated with an increased risk of Type 2 diabetes, but the results are less conclusive. Results from randomized controlled trials in non-diabetic subjects with major depression show that eicosapentaenoic acid is an effective adjunct treatment of depression in diabetes, while docosahexanoic acid is not. Moreover, consumption of omega-3 PUFA reduces the risk of cardiovascular disease and may therefore indirectly decrease depression in Type 2 diabetes, via the reduction of cardiovascular complications. Conclusions: Supplementation with omega-3 PUFA, in particular eicosapentaenoic acid, may be a safe and helpful tool to reduce the incidence of depression and to treat depression in Type 2 diabetes. Further studies are now justified to test these hypotheses in patients with Type 2 diabetes.