Ignoring for the moment all the biochemistry/physiology/endocrinology that is relevant, I have found that constant feedback can be quite helpful. Weigh in on a regular basis; knowing the scale awaits in the morning will give you the strength to do the needed push-aways at the dinner table. Also, set a concrete goal rather than vaguely wanting to weigh less or just not gain too much. That seems to work best for most people and will give you something to celebrate. You can always set a new goal after you reach the first one.
RIP Zig Ziglar