We're surrounded by food portions we've been led to believe are normal-64-ounce sodas, personal pizzas large enough to feed several people, and steaks and pastas that fill an entire plate. No wonder obesity rates in America have reached an all-time high. We eat oversize portions, gain weight, and try the latest fad diet, which only adds to our confusion about how to lose weight. Nutritionist and portion-size expert Dr. Lisa R. Young says the solution...