Why Do the Media Constantly Push An Unhealthy Body?

I took to the Internet this evening in search of the answer to this question, and found that these articles tackled the subject nicely:

http://www.eating-disorders.org.uk/media-and-eating-disorders.html

http://savageminds.org/2010/10/29/why-thin-is-still-in/

http://www.adiosbarbie.com/2012/10/skinny-curvy-and-still-not-fitting-the-mold/