When I realize I have reached my full limit, but there is still yummy food on my plate (and I normally would keep eating until it was all gone) I reach for a condiment on the table (like salsa, pepper, be creative!) and cover the rest of my food with it so it forces me to not go back and munch!
Before, I used to work out like crazy and eat barely anything while I did not lose very much. Little did I know, I was eating way too late. Now, even on days when there is no time to exercise or eat that well, I make sure to eat earlier than 8pm. The earlier the better. Try it and you will lose!