I was an extreme case, but I just told myself "I dont eat that anymore" (that could have been candy bars or donuts or fast food or soda or whatever). It took all the angst out of picking what to eat, I simply didn't eat those kinds of food. It just made things really easy for me - I planned ahead and always had the kind of food I did want to eat on hand, so there was no excuse. The few times I did eat off plan, I just told myself that life was messy and complicated and I should always do the best I can and immediately get back on track.
It was a bit of a challenge when I reached maintenance and had to re-integrate some of the "no" foods that I did want to eat for the rest of my life (dark chocolate, home made baked goods, red wine) but I did figure it out.
SIX YEARS at maintenance weight!
My very long weight loss story
"I saw an angel in the marble and I chiseled until I set it free."