I just read this book called Mindless Eating by Brian Wansink, and I wanted to recommend it to you all. The author studied the psychology of external factors that cause us all to overeat. It was very eye-opening, and just from reading it, I am able to stop myself from eating mindlessly as often. One of the anecdotes in there is from one of his acquaintances who lost weight by just saying out loud if he caught himself eating if he wasn't hungry "I'm not hungry, but I'm eating this anyway". That one is a pretty good strategy. Anyway, he talks about the studies he's done with serving sizes, how food is presented and so forth and how it affects the amount people eat. Very informative and enlightening.