"They use larger plates. When offered two plate sizes, 98.6 percent of those with the highest BMIs took the larger of the two plates to the buffet. A bigger plate tricks your eye into thinking you're not eating as much, and stuffing more food onto your plate -- and into your mouth. Use a smaller plate, get a smaller belly"

I just finished reading The 9-inch Diet. It's not really a diet book. It's more about how we've slowly been led into eating more at each meal through a series of subtle changes, one of which is that the average size of a dinner plate has expanded from the former norm of 9-inches to a current norm of 12. The author advocates the simple little change of purchasing and using 9 inch dinner plates. You'll quickly adjust to the smaller plate size, and naturally eat less food.