Knowing something in theory and actually practicing it are very different. Diet brain wants to work it all out logically beforehand. You can read and think about change all you want, but it's the messy daily practice that actually creates change. Actions, not thought. The way to stay stuck is to believe you have to change your mind first - stop obsessing, become weight neutral, lose the fear, whatever, and then you'll be able to change your actions. It's the other way around. Change your actions and your brain changes.