Yikes - that would be tough!!! If it were me, I'd keep a big bowl of water nearby and every time I cut a piece off, I'd toss it in the bowl before I even thought about eating it. Like, just make it a habit so that it's done before your conscious mind catches on. Or maybe throw some cayenne pepper on it or something?
If you think about it, though, it's waste either way - either it's waste in the trash or waste in your body, messing up your diet. No one really wins if you eat it out of obligation