Thirty seven days is awesome!
I don't think you should feel guilty if you slip and have a twinkie. Everything in moderation (I'm talking food here!)
I had a friend who quit drinking and went on a health kick. It was fine that he was concerned about what he was eating, but he would point out the amount of fat grams in the snack you were eating. He had to learn to rein it in. I also recall he binged on bad food occasionally. I am not sure if it was related to his recovery or if he just took things to an extreme