It is tough, no doubt. I know you have to get into the habit of good eating, but it is easier said than done. One comment I have seen in relation to weight loss, that always sticks in my mind: "there are rare individuals who do manage to keep it off - They never don't think about their weight." Basically seems to mean that you always have to keep at it, if you get lazy, or just plain dont keep it in focus, it will come back.
It seems like I am forever working on it.