So the Yale University Center for Eating and Weight Disorders has put together a little check list. If you just do what they say, you can look like Barbie or Ken.
As reported in the International Journal of Eating Disorders, here are the goals:
The average woman who wants look like Barbie has to grow 2 feet taller, gain 5 inches in the chest, lose 6 inches in the waist, and lengthen her neck by slightly more than 3 inches.
The average man who wants to look like Ken has to grow 20 inches taller and increase his chest by 11 inches and his neck circumference by about 8 inches.