They treat depression as if it were caused by a chemical imbalance: Pump in more of one key ingredient, or sop up another, and you will have fixed the problem. Beck_BR-2 Prepared: One day, soldiers heading into combat could be … “I really do think stress is to mental illness as cigarettes are to heart disease,” says Gerard Sanacora, the psychiatry professor running the ketamine trial at Yale. The theory describes stress grinding down individual neurons gradually, as …