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A healthful diet can "significantly reduce" symptoms of depression. That's the definitive conclusion from a meta-analysis of existing randomized, clinical trials. Researchers have long suspected that a poor diet can lead to poor mental health. Although the underpinnings of mental health problems are complex, some scientists have suggestedTrusted Source that "diet is as important to psychiatry as it is to cardiology, endocrinology, and gastroenterology."