If you think, “I was ‘good’ and turned down [unplanned food] five times, so it’s okay to have some extra now,” remind yourself that if you had a terrible peanut allergy you would NEVER think, “I was ‘good’ and turned down the peanut butter cookies five times so it’s okay to have one now.” No matter how many times you turn down unplanned food, it doesn’t legitimize eventually giving in.