Sometimes discussing things such as mental disorders, drug addictions, or eating disorders can be problematic due to the adcoms’ variable impressions. You don’t want colleges to immediately cross you off and label you as a liability. If you, in your essay, can beautifully articulate how you have improved from the struggle, how it has made you stronger, and how you plan to proceed positively with your life, then you will be fine.
What you don’t want colleges to think is that you will get to college, crumble under the pressure, and relapse. That’s why in your essay, it is important that you don’t highlight the past as much as you need to highlight the future. Clearly your anorexia has affected your career goals and has inspired you to study biopsychology. Being able to tie the two together and have them equal something positive is key.
Positive positive positive. Maybe if you asked on the parents’ forum, you might have a wider range (and a more experienced range) of answers from parents who have been down this road with their own children.