I think Steve's idea is great, and it goes right in line with my own default concept. When I talk to people about making decisions, I advise them to ask the same question I ask myself:
"What do you want
I think Steve's concept of asking, "Is this me?" is right along those lines. If something doesn't resonate with you, then you shouldn't do it, no matter how much "sense" it makes!
The same could be said for things that don't make sense, though. For instance, when you are considering an unhealthy treat, like a big ol' ice cream cone, or a double scotch on the rocks, ask yourself the same question.
"What do I want
Chances are that you DO in fact want that treat, and having it isn't going to kill you. However, ask yourself the same question, only in follow-up mode:
"Do I want
to get really (fat, drunk, etc.) by constantly indulging in this practice?"
Chances are that as much as you want the "treat," you don't really want the habit
Make decisions accordingly!