New Cochrane research concludes that there is insufficient evidence for the use of Omega-3 fatty acid supplements in treating major depressive disorder.
Omega-3 fatty acids are widely thought to be essential for good health and are naturally found in fatty fish such as tuna; other seafood; and some nuts and seeds.
Omega-3 fatty acids have been widely promoted globally and are readily available as an over-the-counter supplement. These supplements have hugely increased in popularity over the last decade, together with a range of other supplements including ginseng, garlic, green tea, vitamins, minerals, and herbal products.
More recently there have been various studies that have suggested a role for Omega-3 fatty acid supplementation in treating major depressive disorder. Adults with major depressive disorders are characterized by depressed mood or a lack of pleasure in previously enjoyed activities for at least two weeks, in the absence of any physical cause, that impact on everyday life.
Figures published by the World Health Organization in 2011 estimated major depressive disorders to account for 3% of global ill health; projections for 2030 suggest an increase to 6% or 7%.
A new Cochrane Review, published today in the Cochrane Library, gathered together data from 26 randomized trials involving a total of 1,458 participants. The trials investigated the impact of giving an Omega-3 fatty acid supplement in a capsule form and compared it to a dummy pill. In one study, involving 40 participants, researchers also investigated the impact of the same supplementation compared to an anti-depressant treatment.
The Cochrane authors found that, whilst people who were given Omega-3 fatty acids reported lower symptom scores than people with the dummy pill, the effect was small and there were important limitations that undermined their confidence in the results. Their analyses showed that although similar numbers of people experienced side effects, more data would be required to understand the risks of taking Omega-3 fatty acids.
Lead author Katherine Appleton from Bournemouth University said, “We found a small-to-modest positive effect of Omega-3 fatty acids compared to placebo, but the size of this effect is unlikely to be meaningful to people with depression, and we considered the evidence to be of low or very low quality. All studies contributing to our analyses were of direct relevance to our research question, but most of these studies are small and of low quality.”
She added, “At present, we just don’t have enough high-quality evidence to determine the effects of Omega-3 fatty acids as a treatment for major depressive disorder. It’s important that people who suffer from depression are aware of this, so that they can make more informed choices about treatment.”
Read the press release in Spanish here.
Full citation: Appleton KM, Sallis HM, Perry R, Ness AR, Churchill R. Omega-3 fatty acids for depression in adults. Cochrane Database of Systematic Reviews 2014, Issue 5 . Art. No.: CD004692. DOI: 10.1002/14651858.CD004692.pub3.
URL Upon publication: http://doi.wiley.com/10.1002/14651858.CD004692.pub3
Lead author: Katherine Appleton, Associate Professor, Department of Psychology, Bournemouth University, Poole House, Fern Barrow, Poole, BH12 5BB, UK: E-mail: email@example.com.
Cochrane is a global independent network of researchers, professionals, patients, carers, and people interested in health. Cochrane produces reviews which study all of the best available evidence generated through research and make it easier to inform decisions about health. These are called systematic reviews. Cochrane is a not-for profit organization with collaborators from more than 130 countries working together to produce credible, accessible health information that is free from commercial sponsorship and other conflicts of interest. Our work is recognized as representing an international gold standard for high quality, trusted information. Find out more at http://cochrane.org Follow us on twitter @cochranecollab
If you are a journalist or member of the press and wish to receive news alerts before their online publication or if you wish to arrange an interview with an author, please contact the Cochrane press office: firstname.lastname@example.org.
Wiley is a global provider of knowledge and knowledge-enabled services that improve outcomes in areas of research, professional practice, and education. Through the Research segment, the Company provides digital and print scientific, technical, medical, and scholarly journals, reference works, books, database services, and advertising. The Professional Development segment provides digital and print books, online assessment and training services, and test prep and certification. In Education, Wiley provides education solutions including online program management services for higher education institutions and course management tools for instructors and students, as well as print and digital content. The Company's website can be accessed at www.wiley.com.
If you would like to request complimentary media access to the contents of the Cochrane Library, please email email@example.com.