A New Year's resolution to lose weight and establish healthy habits may seem to demand a pricey diet plan. But there's a simpler -- and cheaper -- approach: portion control. As portion sizes in America have increased over the past few decades, so have rates of obesity and other related health problems. A key part of maintaining a healthy weight is eating right-sized meals that meet daily caloric requirements. These portion-control tools measure recommended serving sizes for frugal dieters seeking a helping hand.