The article says "Eating disorders are more common among male and female runners than among the average population"
I'm not so sure I agree with that statement. I have a history of eating disorders but thankfully it was 20 years ago and I am free of all that now.
'Runners' generally take good care of their bodies and nutrition, so they can continue running and avoid injury.
Whereas, in my experience, people with eating disorders are on self destuct a lot of the time.
I think it's more of a case of people with eating disorders start running to assist the self destruct process and lose weight more rapidly, or enable them to binge more and not gain weight, which is not the mentality of 'a runner'.
Also, there is no real way of gauging the problem as a whole in society because most of it is done in secret.