A study mentioned on the ANAD site that was published in European Eating Disorders Review noted that health college females, with no previous history of eating-disordered behaviors, were exposed to 1.5 hours of pro-eating-disorder websites. The female students subsequently exhibited reduced caloric intake over the following week. Why do you think this happened?
One possible answer might be that exposure to these websites brought attention to flaws in themselves made them feel self-conscious. So they then engaged in eating-disordered behavior to reduce anxiety about their body image.