I have seen that many times, that some people [especially women] go off an "eating plan" because they do feel a sense of security being in a "chubby" state. My guess is that it is something from their past that triggers that need for security. As for going off the plan for a few weeks to eat "items" not allowed, what about just having a day here and there? For example at Christmas eat what U want [ but dont stuff yourself] then the next day go back to low-carbing. For any holiday or special occassion you can do it that way and yet you will be able to handle the damage control.