6. Your Dishes Are Too Big
On average, people eat 92 percent of what they have on the plate in front of them, rather than just stopping when they feel full, according to Brian Wansink, a food expert who does extensive research on food psychology and is the director of the Cornell University Food and Brand Lab. Use a 10-inch plate instead of a 12-inch plate and you'll serve yourself 22 percent less food. Wansink also proved that subjects eating soup from a bowl with a hidden tube that slowly refilled it ate 73 percent more than those eating from a regular bowl—without feeling as if they had eaten more. So defer to smaller china and take a break before you decide to refill it.