How does anorexia develop through operate and classical conditioning?

Anorexia nervosa develops through classical conditioning mostly because they feel that they are not thin enough in a society that demands perfection and perfection is being thin, and 'beautiful' (despite the fact that everyone has their own idea of beautiful). Anorexia nervosa develops through operant (operate, as you put) because they feel they have the need to maintain this image and the difficulty of dealing with the consequences of this 'perfection' drives them even further over the brink because they deal with these negative feelings by taking it out on their own bodies.