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Nutritional value of EPA-rich omega-3 fish oil may help depression without anxiety as much as Rx antidepressants

  [ 37 votes ]   [ Discuss This Article ] • June 21, 2010

The use of Omega-3 (fish oil) supplements is effective among patients with major depression who do not have anxiety disorders, according to a study directed by Dr. Francois Lesperance, head of psychiatry at the University of Montreal’s Hospital Center. (“The Efficacy of Omega-3 Supplementation for Major Depression: A Randomized Controlled Trial,” published online June 15 by the Journal of Clinical Psychiatry.)

This was the largest study ever conducted assessing Omega-3 high-EPA fish oil's efficacy in treating major depression.

It was carried out by a collaboration of researchers at the U of Montreal and eight other Canadian clinics.

• Initial analyses failed to clearly demonstrate the effectiveness of Omega-3 for all patients taking part in the study.

• Other analyses, however, revealed that omega-3 improved depression symptoms in patients diagnosed with depression unaccompanied by an anxiety disorder.

• Efficacy for these patients was comparable to that generally observed with conventional antidepressant treatment.

From October 2005 to January 2009, 432 male and female participants with major unipolar depression were recruited to take part in this randomized, double-blind study (neither patients nor researchers knew which capsules patients received).

For eight weeks, half of the participants took three capsules per day of … a fish oil supplement containing high concentrations of eicosapentaenoic acid (EPA).

The other half took three identical capsules of a placebo consisting of sunflower oil, flavored with a small quantity of fish oil.

Group a ‘Real-Life’ Patient Mix

In contrast with typical clinical studies designed to assess the effectiveness of antidepressants, this study included a high proportion of patients with complex and difficult-to-treat conditions, including:

• Patients resistant to conventional antidepressant treatments

• And patients also suffering from an anxiety disorder.

The aim was to assess the value of Omega-3 supplementation in a group of individuals more like those treated in outpatient clinics.

Searching for Safe Depression-Relief Alternatives
Some 11% of men and 16% of women in Canada will suffer from major depression at some point in their lives, making this disorder one of our society's leading public health issues. Depression, which is now the world's fourth leading cause of morbidity and death, is expected to move up to the number two position by 2020.

"Despite significant progress in neuroscience over the past two decades, depression is difficult to treat," Dr. Lespérance noted. In view of the large number of patients who stop taking their medications in the first few months of treatment and those who refuse such treatment due to fear of stigmatization or side effects, it comes as no surprise that a large number of patients suffering from major depression use alternative treatments offered outside the healthcare system.

"Many of these treatments have not been adequately evaluated. That is why it was important to assess the efficacy of Omega-3, one of the most popular alternative approaches," he added.

• Epidemiological and neurobiological studies have suggested that a relative deficit in polyunsaturated fatty acids of the Omega-3 group may predispose individuals to psychological disorders such as depression.

• Further, several preliminary clinical studies based on small numbers of patients have suggested that Omega-3 supplements with high concentrations of EPA can help to reduce symptoms of depression among patients who fail to respond to an initial antidepressant treatment.

• These studies have not, however, convinced the entire scientific community. A broader study was needed to acquire further knowledge about the properties and efficacy of high-quality Omega-3 supplements among patients suffering from major depression.

…It is important to note that the study assessed use of Omega-3 for eight weeks, at doses of 1050 mg of EPA and 150 mg of DHA each day. It is currently unknown whether taking higher doses or taking supplements over a longer period would yield different results.

These encouraging results show that use of EPA is effective among patients with unipolar depression unaccompanied by an anxiety disorder. Additional research directly comparing Omega-3 with conventional antidepressants could more clearly confirm their usefulness for patients suffering from depression.

Source: University of Montreal Hospital Center press release, Jun 21, 2010

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