That's a very good question. I do think that everyone is different, I really do. If I had to pick one piece I would say it has to be the attitudes and beliefs of society that are then taken and put forward generation after generation.
I think if we take the genetic piece and the biological piece, we all know that genes can be expressed or not expressed, depending on situational factors such as environment and social...and depending on which type of gene we're looking at. So I think if we change our attitudes and beliefs in our culture around many things, we can help with many mental illnesses, including eating disorders.