1. Serve meals on nine- to ten-inch plates. Any smaller and you'll be going back for seconds; larger, and you'll pile on more to begin with.
2. Take the serving bowls off the table! The only exception: the ones containing vegetables.
3. Drink from a skinny glass. Your mind perceives height more readily than width, so you'll think you had more.
4. Choose a small serving spoon: In one Cornell study, participants ate 11 percent less ice cream when they used a petite scoop.
5. Control your environment—if the room in which you eat is too bright and loud, or too dark and quiet, you'll tend to eat more because you become overstimulated or linger too long at the table. Next: How to lose weight by thinking like a thin person