The serotonin theory of depression has been around for a good 60 years and is often used as justification for the use of antidepressants, specifically selective serotonin re-uptake inhibitors (SSRIs). Understandably, a review published recently by psychiatric researcher Joanna Moncrieff, which concluded that there was no consistent evidence of an association between serotonin and depression, and no support for the hypothesis that depression is caused by lowered serotonin act
