Slowing down is a good point. You enjoy your food, and can tell when you're full. Stomach "feedback" isn't instantaneous.

We also learned to drink a glass of water a few minutes before a meal. Cuts down on how much you eat.

My wife is healthy food police around these parts, and reads about it all the time. One thing she's read that we found to be true:

Most Americans mistake thirst for hunger. We're also nearly always in some level of dehydration (which causes weight gain since processing food takes a lot of water). If you back off the: tea; coffee; softdrinks and train yourself to drink water. It'll help in more ways than you realize.