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Omega-3 fatty acids for the treatment of depression: systematic review and meta-analysis
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Omega-3 fatty acids for the treatment of depression: systematic review and meta-analysis
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Journal Article
Omega-3 fatty acids for the treatment of depression: systematic review and meta-analysis
2012
Overview
We conducted a meta-analysis of randomized, placebo-controlled trials of omega-3 fatty acid (FA) treatment of major depressive disorder (MDD) in order to determine efficacy and to examine sources of heterogeneity between trials. PubMed (1965-May 2010) was searched for randomized, placebo-controlled trials of omega-3 FAs for MDD. Our primary outcome measure was standardized mean difference in a clinical measure of depression severity. In stratified meta-analysis, we examined the effects of trial duration, trial methodological quality, baseline depression severity, diagnostic indication, dose of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in omega-3 preparations, and whether omega-3 FA was given as monotherapy or augmentation. In 13 randomized, placebo-controlled trials examining the efficacy of omega-3 FAs involving 731 participants, meta-analysis demonstrated no significant benefit of omega-3 FA treatment compared with placebo (standard mean difference (SMD)=0.11, 95% confidence interval (CI): −0.04, 0.26). Meta-analysis demonstrated significant heterogeneity and publication bias. Nearly all evidence of omega-3 benefit was removed after adjusting for publication bias using the trim-and-fill method (SMD=0.01, 95% CI: −0.13, 0.15). Secondary analyses suggested a trend toward increased efficacy of omega-3 FAs in trials of lower methodological quality, trials of shorter duration, trials which utilized completers rather than intention-to-treat analysis, and trials in which study participants had greater baseline depression severity. Current published trials suggest a small, non-significant benefit of omega-3 FAs for major depression. Nearly all of the treatment efficacy observed in the published literature may be attributable to publication bias.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Adult and adolescent clinical studies
/ Analysis
/ Bias
/ Biological and medical sciences
/ Depressive Disorder, Major - drug therapy
/ Dietary Supplements - statistics & numerical data
/ Fatty Acids, Omega-3 - therapeutic use
/ Humans
/ Medicine
/ Placebos
/ Psychology. Psychoanalysis. Psychiatry
/ Publication Bias - statistics & numerical data
/ Randomized Controlled Trials as Topic - methods
/ Randomized Controlled Trials as Topic - psychology
/ Randomized Controlled Trials as Topic - statistics & numerical data
/ Reviews
