A lot of media influence is negative, and can even lead to eating disorders. In all the magazines young girls read, all they see are perfect skinny models with their ribs sticking out. Girls need to realize that there is no such thing as perfect; and skinny does not mean beautiful. It is good to stay in shape, but being able to see bones popping out is not in shape.
The above link shows a picture of Nicole Richie during her eating disorder. What kind of message is this sending to young girls? I hope it is sending the message that being extremely skinny is not pretty.