I think the causes of eating disorders have changed over the years but I also believe that ultimitaly it s a psychological problem wth the indivaidual.
I believe that images of stunning celebrities do inspire children to want to achieve the image but there have been stunning celebrities for many eras, if anything concerning magazines is causing the problem it is not photos of these skinny celebs in magazines, it is the magazines criticism of anyone who has either put on weight or is heavy anyway. These magazines are ridiculous, in the same issue they will preach about size zero celebs and anorexia while doing an 8 page spread laughing at the 'horror' of Britney Spears's belly in a bikini and Denise van outen having a builders bum.
Ultimately though I don't think Kate Beckinsdale was wrong to suggest the problem may start at home. It is a psychological problem. If children still in Primary school are developing eating disorders there must be something wrong at home. They shouldn't even be conscious of image, unless they are really overweight. As for secondary school children and adults, yes, they probably do have insecurities that parents could have helped try to overcome, and the monitoring of their situation should have been paid more attention to by the parents. However, it is ultimately down to the individual. They choose to do this to themselves.