Fish Oil (Omega-3) consumption has been previously associated with improving the symptoms of depression. A new study published in the February, 2010  Archives of General Psychiatry reported a three month course of fish oil supplements were as effective as drugs, in reducing the rate of schizophrenic episodes of psychotic illness.


Long-chain omega-3 fatty acids are a promising intervention in individuals with schizophrenia, who may have an underlying abnormality in the way their cells use fatty acids, noted the study’s authors note, G. Paul Amminger, M.D., of Medical University of Vienna, Austria, and Orygen Youth Health Research Centre, Melbourne, Australia.


The researchers conducted a randomized, double-blind, placebo-controlled clinical trial of their effect on the risk of progression to psychosis in 81 individuals at ultra-high risk. These individuals either had mild psychotic symptoms, occasional psychosis or a family history of psychotic disorders plus a decrease in functioning. These criteria identify individuals whose risk of becoming psychotic may be as high as 40 percent in a 12-month period.


Half of the group on a daily basis took  fish oil 1.2 grams of omega-3 fatty acids for 12 weeks, while the other half took a placebo.  It was a double blind study, and the participants did not know which treatment they were receiving.


They were followed for a year to and two in the fish oil group developed a psychotic disorder compared to 11 in the placebo group.


The researchers concluded that individuals at extremely high risk of developing psychosis appear less likely to develop psychotic disorders following a 12-week course of fish oil capsules.


“Early treatment in schizophrenia and other psychoses has been linked to better outcomes,” the authors write as background information in the article. “Given that subclinical psychotic symptoms may predict psychotic disorder and psychosis proneness in a population may be related to the rate of psychotic disorder, intervention in at-risk individuals holds the promise of even better outcomes, with the potential to prevent full-blown psychotic disorders.”


Based on the results, the authors estimate that four adults would need to be treated with omega-3 fatty acids to prevent one from developing psychosis over a 12-month period. Polyunsaturated fatty acids also significantly reduced symptoms and improved functioning compared with placebo. Rates of adverse effects were minimal and similar between the two groups.


The potential effects of fatty acids on psychosis development may result from changes to cell membranes and interactions with neurotransmitter systems in the brain, the authors note. “The finding that treatment with a natural substance may prevent or at least delay the onset of psychotic disorder gives hope that there may be alternatives to antipsychotics for the early symptomatic phase,” the authors write. “Stigmatization and adverse effects – which include metabolic changes, sexual dysfunction and weight gain – associated with the use of antipsychotics are often not acceptable for young people.”


In contrast, omega-3 fatty acids may cause some digestive complications but largely “are free of clinically relevant adverse effects. They have the advantage of excellent tolerability, public acceptance, relatively low costs and benefits for general health,” the authors conclude. “Long-chain omega-3 fatty polyunsaturated fatty acids reduce the risk of progression to psychotic disorder and may offer a safe and efficacious strategy for indicated prevention in young people with subthreshold psychotic states.”



G. Paul Amminger; Miriam R. Schafer; Konstantinos Papageorgiou; Claudia M. Klier; Sue M. Cotton; Susan M. Harrigan; Andrew Mackinnon; Patrick D. McGorry; Gregor E. Berger. Long-Chain ω-3 Fatty Acids for Indicated Prevention of Psychotic Disorders: A Randomized, Placebo-Controlled Trial. Arch Gen Psychiatry, 2010; 67 (2): 146-154 [link]