For years, scientists had wondered why Greenland Eskimos had such a low incidence of heart disease, despite a diet of seal blubber and other high-fat foods. Studies eventually revealed the reason: They eat a lot of fish rich in compounds called omega-3 fatty acids, a "good" fat with cardioprotective effects. Now, compelling new evidence suggests these fish oils may be providing another benefit as well--keeping the Eskimos "even keeled" and happy.
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In a study from Harvard Medical School, assistant professor of psychiatry Dr. Andrew Stoll and colleagues at McLean Hospital in Boston, USA, found that the omega-3s in salmon, mackerel, tuna, sardines, and other deep sea, cold-water fish may have a profound effect on mood.
In the study (Archives of General Psychiatry, 5/99), 30 patients with manic depression--also called bipolar disorder--received either fish oil or olive oil (as a placebo) along with their standard medications, including lithium. After four months, 65% of the fish oil recipients improved, compared with only 19% of the olive oil group. The results were so impressive that the researchers halted the study early so that those in the placebo group could begin taking fish oil if they wished.
No one knows exactly how omega-3s regulate mood. One theory is that they work like lithium and certain other standard drugs by dampening overactive nerve-to-nerve communication channels in the brain. "We know that omega-3s have this effect in other parts of the body, so we assume that it happens in the brain as well," says Dr. Stoll. "The other theory is that we are simply replacing what's missing in the Western diet," he says.
"Omega-3s, which are lacking in diets in the U.S. and other developed countries, are very abundant fats in the brain and are essential for normal brain function," says Dr. Stoll. "It's likely that they are involved in a range of disorders in addition to manic depression, including major depression and schizophrenia."
A safe, natural mood stabilizer Dr. Stoll is beginning a more rigorous manic depression study, and trials of omega-3s for other forms of depression are under way. Still, he finds the data promising enough to recommend omega-3s to many of his own patients with depression or manic depression.
"In mild cases we sometimes go with omega-3s first because you have very little to lose and everything to gain," says Dr. Stoll. "If the person doesn't respond to omega-3s, you can move on to conventional treatments." He cautions, however, that anyone with depression or manic depression should first see a doctor. "It's not that the therapy is dangerous, but the conditions are dangerous and need professional intervention," he says.
Unlike Prozac and other antidepressants that can cause sexual problems and other troubling side effects, fish oils appear to cause nothing more serious than occasional indigestion. They are also compatible with most prescription medications, although those taking blood-thinning drugs or herbs, such as Coumadin, aspirin, or ginkgo biloba, should watch out for excessive bleeding since, in theory at least, fish oils may have an anticoagulant effect.
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