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Countries whose citizens consume greater amounts of seafood and fish oil rich in omega-3 fatty acids seem to have lower prevalence of depression, post-partum depression and seasonal affective disorder.
Omega-3 fatty acids are linked to positive effects on depression. The brain contains a high concentration of omega-3 fatty acids and many studies have focused on their role in brain function. Depression has increased in Western countries in contrast to a decreased dietary intake of omega-3 fatty acids. Countries whose citizens consume greater amounts of seafood (which contains high amounts of omega-3) seem to have a lower prevalence of depression, post-partum depression and seasonal affective disorder. Interestingly, many reports suggest that omega-3 fatty acids can alleviate depression by entirely different means than standard antidepressants, with no relevant side effects. Studies also indicate that omega-3 even improves the functionality of antidepressants.
A C Logan (2003) Neurobehavioral aspects of omega-3 fatty acids: Possible mechanisms and therapeutic value in major depression. Alternative Medicine Review, 8, 410-425.