Dolls and Body Image

Many writers and filmmakers who address gender issues cite dolls, specifically Barbie, as a significant influence on female body image.  In Tough Guise, Jackson Katz implies that the increased musculature of action figures leads boys to feel inadequate and overcompensate with violent behavior.  But how much of an influence on gender-related body image can a toy really exert?  The Onion mocks such concerns with its piece about Bratz dolls with enormous heads.  The Simpsons playfully grapples with the issue in "Lisa vs. Malibu Stacy."  To what extent has your body image been influenced by dolls and action figures?