Are all cases of depression the same? Dr. William Walsh thinks this is unlikely. After working with more than 30,000 patients, Dr. Walsh has identified specific chemical imbalances that lead to emotional and mental problems. Out of his experiences, he identified five distinct biotypes from what was once lumped together as ‘clinical depression:’ undermethylation; folate deficiency; copper overload; pyrrole disorder; and toxic metals. He will be presenting on the five biotypes at the Restorative Medicine Conference in Tucson, AZ this fall.