1) Know your weaknesses – for me, its a bag of wafers. If I open it, I can easily finish it. So instead of trying to control myself, I avoid it. [disclaimer: dont avoid wafers just because I cant finish them] If you know you cannot avoid the temptation of the cakes and cookies, eat less at the meals. Yes your calories wont be as quality, but you wont be eating an extra 1,000 calories that day.
2) Avoid kugels – they hide plenty of eggs and oil in them.
3) Avoid having too much challah
4) Help out a lot in the kitchen – if you are cleaning up from a course or serving the next, you will have less time to be eating at the meal
5) Avoid caloric drinks like soda and juice. If you like carbonation, try seltzer
Good luck. Now if only I can practice what I preach here 😉