Here are some strategies: 1) eat slow - you'll get full faster - the food's not going anywhere.
2) drink a lot of water before and during your meal - water fills you up. - not juice, soda, or other drinks. 3) eat soup as the first course - again water fills you up. 4) don't take second helpings. 5) put all the food you want to eat on your plate - see if it's reasonable, and then eat only that.