Cognitive behavioral therapy (CBT) has become one of the most widely studied and widely used forms of therapy for depression. And for good reason: It works! The goal of CBT, which typically involves one-on-one sessions with a therapist once or twice a week, is to help people change their thoughts in order to change their behavior and alter their mood. “With CBT, a therapist takes an active role in challenging the negative thoughts that contribute to loss of control, feelings of helplessness or hopelessness and other symptoms of depression,” explains Landau. It may even have a preventive effect: Research from Stockholm, Sweden, found that when new moms who were considered at risk for postpartum depression went through three weeks of CBT, their mood scores improved more rapidly than those who received standard care (a single follow-up visit to a midwife or OB).