Karen Healey (M.A. University of Canterbury, New Zealand) and Terry D. Johnson (M.S. Department of Bioengineering, UC Berkeley) have recently written a paper examining the comparative body mass indexes of real people versus those seen in the marvel comics. A quick look at their chart shows how far out of whack women are being portrayed, but it's really worth it to read through their whole paper.
(Special thanks to a certain you-know-who-you-are for pointing this out to me.)