two tips that help me:
have a big pot of veg soup in the fridge. I make my own from scratch, and try to stay away from the starchy veggies, so it will include - onion, lots of celery including the tops, celery root, cabbage, spinach, squash (*the ones we get here have a high water content), mushrooms etc. I steam the veggies first for about 20 minutes, then add boiling water and let it simmer for about 30 minutes more.
second is to have salad fixin's ready to go - i wash and cut up lettuce and cabbage and other veg so that if i come hoome hungry they are ready to go while I'm putting together a meal.
I have been trying the "eat only when you are hungry" and "stop when you've had enough" - it's a big adjustment for me.