For more details on why I'm asking this question, you can go here:
http://biodeterminism.blogspot.com/2007/01/what-does-anorexia-and-news-media-have.html
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No it is not caused by genes. It is caused by a poor self body image or a distorted body image that causes you to do extreme things like overexercise, not eat and abuse laxatives because you always see yourself as fat or not thin enough even though you may be skin and bones.

No it is not caused by genes. It is caused by a poor self body image or a distorted body image that causes you to do extreme things like overexercise, not eat and abuse laxatives because you always see yourself as fat or not thin enough even though you may be skin and bones.
References :