Thin dolls like Barbie can make children as young as five want a slimmer body, a new study warns. UK scientists asked girls between the ages of five and nine to play with two ultra-thin dolls, including Barbie, and two dolls portraying a more realistic body weight. The two ultra-thin dolls, both made by American toy giant Mattel, immediately reduced the girls' ideal body size, the researchers found. Lucy Mathison ...