"Consult your gut"
This one goes along with yesterday's tip, "eat when you're hungry, not when you're bored". Along with making sure you aren't trying to cure boredom or stress with food, be sure that you aren't allowing external cues to determine how much you eat. For example, if you fill a large plate with food, the tendency is to feel like you are done eating once the plate is empty. Slow down and pay attention to when your body tells you that you've had enough to eat, rather than letting your eyeballs make that decision.
All the tips given for the 28 Days of Real Food Challenge were compiled from "Food Rules", by Michael Pollan.