I know that to keep myself on the straight and narrow low carbing, I intentionally look at certain foods as good and evil. It's a mental mechanism to keep me away from thinking "just one bite won't hurt".
Right now, I'm avoiding all grains like the plague (eventhough my own diet allows them as long as it's within the 10g carb/meal rule).
I'm avoiding all dairy that has more lactose than cream cheese - but now that's because I now have an intolerance...so it really IS evil to my tummy!
Sugar, of course, is pure evil.
Keeping this perspective helps keep me on track.
But I do know that I REFUSE to villify fruits and vegetables (although, for some reason, I still think bananas are the fruit of the devil!). And I don't consider potatoes real vegetables. :-)
I know that once I'm on maintenance, I will want to and probably should eat more fruits and vegetables...so I'm working NOW to make sure I don't create that impervious mental block for myself.
I think it's simply a self-protective mental mechanism you've developed, and you need to come to grips with whether or not you need to keep that mechanism in place now that you're in maintenance. Some of us may have to keep some of those mental mechanisms in place for the rest of our lives to make sure we don't go back down the slippery slope. Others may have a more healthy attitude regarding foods and temperance with certain types.