Anorexia caused by autism?

A Scottish professor says that severe cases of anorexia (are any cases mild?) in women may be caused by autism.
Autism, characterised by defects in communication and social interaction, also makes many anorexic patients unresponsive to traditional treatments and may be responsible for anorexia’s low recovery rates, according to Professor Christopher Gillberg, of the University of Strathclyde.
Although autism is thought to be a male problem, affecting up to four times more boys than girls, the disorder has been overlooked in women because their autistic traits present themselves differently, according to Prof Gillberg. An obsession with counting calories, for instance, may be an outward sign of autism.
“Our research has shown that a small but important minority of all teenage girls with anorexia nervosa in the general population meet diagnostic criteria for autistic disorder, Asperger syndrome or atypical autism. I’ve seen quite a number of cases where the anorexia has become completely entrenched because people haven’t understood that underlying the eating disorder is autism.”

Gillberg says that this would explain why traditional forms of treatment used for eating disorders, such as family therapy, doesn’t work for some women.
I’ve known many women with eating disorders, and there certainly is a good amount of obsessive compulsiveness going similar to autistic tendencies. But it’s unclear to me whether that’s the cause or an effect of the eating disorder.
Any thoughts?

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