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Walnuts are one of the richest plant sources of omega-3 fatty acids, and numerous studies have demonstrated how omega-3 fatty acids support brain function and reduce depression symptoms. A study published in the British Journal of Psychiatry is especially interesting. The lead authors ask the question, Why is the vast part biological research — from genetics to psychopharmacology — concentrated on neurotransmitters, when the mammalian brain is approximately 80 percent fat (lipids), and there is a growing body of research demonstrating the critical role of lipids in brain functioning? What’s more, the shift in the Western diet away from these necessary omega-3 fatty acids over the last century parallels the large rise in psychiatric disorders in that time.