Studies show that the size of your dinnerware can really impact how full or hungry you feel; in fact, we're wired to want to finish whatever's on our plate. Instead of piling onto a huge platter, use salad plates or shallower bowls in order to keep portions in check. "Eat your meals off smaller plates and bowls and you'll serve yourself about 10 percent less, which can add up to hundreds of calories less every day," says Julie Upton, RD, of Appetite For Health. How much is just right? Go for bowls that hold no more than 1.5 cups and plates that are less than nine inches in diameter.