20 • If IAm So Smart, Why Can’t I Lose Weight? Your body is not your enemy. It's just doing its job. We need to understand it and manage it so you can create a body that is thin, thriving, and functioning in the way it was designed. So let's dive in and start exploring the cause of overeating: overdesire and overhunger. Your body is not your enemy. It's just doing its job.