Serving sizes have ballooned recently. When dining out, choose a starter instead of an entree, split a dish with a friend, and don't order supersized anything. At home, visual cues can help with portion sizes–your serving of meat, fish, or chicken should be the size of a deck of cards and half a cup of mashed potato, rice, or pasta is about the size of a traditional light bulb. If you don't feel satisfied at the end of a meal, add more leafy green vegetables or round off the meal with fruit.