A new study in The Journal of the American Medical Association (JAMA) has discredited the findings of previous studies which claimed depression was caused by a genetic deficiency of serotonin. The research maintains that depression is not caused by biological factors and is far more likely to be caused by stressful events in a person's life.To read this article in depth got to:
http://www.medicalnewstoday.com/articles/155114.php
To read the original full text:
JAMA. 2009;301(23):2462-2471
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