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The idea that a deficit in the happiness hormone serotonin leads to depression has been around for decades. According to an extensive study, however, there is no evidence for the theory.
Too little serotonin triggers depression, and therefore sufferers must take antidepressants that increase serotonin levels: This myth has persisted for decades. But according to a new publication in the journal «Molecular Psychiatry» There is no evidence that depression is caused by a lack of serotonin or insufficient activity of the substance.
