In my personal experience, psychology is to depression what nutrition science is to obesity. They act like they know what they're doing, but really don't.
Far more than would be appropriate for a hacker news comment ;)
I will share that it is both more complex than many believe - and also less mysterious. "it's chemical" gets overplayed, while our relationship with our emotions is often left unexamined. There's a great deal of interconnectedness and sometimes cause & effect become confused or are tightly coupled. In the end, we're still learning, and everyone is different.
