Hi,

I can't rec many specific Dean eating disorder fics (I go for Sam myself), but there is this one:
http://archiveofourown.org/works/1530608/chapters/3238505 which features bulimic Dean. Its Destiel, and also features Sam and some Bobby too.

There is many more on AO3, if you want to just sift through, and hopefully there will be some in there that you will like :)
http://archiveofourown.org/works?utf8=%E2%9C%93&work_search%5Bsort_column%5D=revised_at&work_search%5Bfandom_ids%5D%5B%5D=27&work_search%5Bcharacter_ids%5D%5B%5D=26&work_search%5Bother_tag_names%5D=&work_search%5Bquery%5D=&work_search%5Blanguage_id%5D=&work_search%5Bcomplete%5D=0&commit=Sort+and+Filter&tag_id=Eating+Disorders

Hopefully that is somewhat useful, sorry to not be more help. Also I'm not sure how to link things properly, so sorry bout the long links.
Good luck :)

hi,
Here are some stories you might enjoy.

rules for hunting
http://procrastin8or9.livejournal.com/2484.html
ritten for the prompt at hoodie_time: Dean had bulimia. "Had" being rather loosely defined- the main thing is that Dean's not binge eating or throwing up anymore and in traditional Winchester fashion the issue's been swept under the carpet. Except that John's been gone on a hunt longer than expected and the food supply is running low. Dean's been sneakily giving most of it to Sam and is starving hungry and worried about where John is. Eventually John gets back on halloween, with food, and Dean manages to choke down some dinner like a normal person. But John's also brought back some candy for trick or treaters- exactly the sort of thing Dean used as binge food. John can't work out why Dean's so jittery, until he realises that with his blood sugar all messed up and the worry Dean's worried about relapsing.
(sequel: http://procrastin8or9.livejournal.com/3005.html )

the dead walk
https://www.fanfiction.net/s/7563979/1/The_Dead_Walk
Contemporary dancer, Dean Winchester, gets injured during a performance. In a vain attempt to control his surroundings, he stops eating. He then meets his soulmate in a pharmacy. Slash: Cas/Dean, Eating Disorder!Dean

thin
https://www.fanfiction.net/s/6887905/1/Thin
Dean had never been the type to obsess about his weight, but now he's trapped in a downward spiral revolving around food and exercise. Can John and Sam save him before it's too late?

Apogee
http://zoemathemata.livejournal.com/15112.html
Prompt: Skinny!sick!Dean and protective!Sam? Perhaps something bad has happened and Dean won't eat anymore.

Struggles
http://archiveofourown.org/works/7180487?view_full_work=true
Castiel transfers to Kansas University to major in writing and get away from his family. His roommate Dean is majoring in business management and taking culinary night classes. The Novak thinks Dean's body is perfection and has been struggling with weight issues for years now. Little did he know that was only the beginning, when he digs deeper into Dean's past. (really sad)

continuation:
empty spaces
http://archiveofourown.org/works/7098655?view_full_work=true
Dean is fine. The way he sees it, things are simple. He had a house and a family and food in his stomach, and now he doesn't. And yeah, that's a downer, but he's not going to let that stop him from being fine, because he's in control of the situation. He definitely doesn't need anyone to save him. And it's not like the weird guy with the nice butt from down the road is the knight-in-shining-armor type, anyway.

catch me when I fall
http://archiveofourown.org/works/2327717?view_full_work=true
S2. Dean has barely been eating since their dad died 5 months ago, which leads to him passing out after a hunt. Sam and Bobby finally realise how much he has been struggling since John's death, and try to help him
Sick!Dean. Worried/Protective!Sam/Bobby. (this is a WIP that hasn't been updated since February , but it's really good)

an attribute of the strong
http://archiveofourown.org/works/3962071?view_full_work=true
Whatever Dean was eating in Purgatory, it wasn't what you'd call well-balanced meals. And adjusting back to 'real' food is harder than he expected. Dean's thin, borderline underweight (despite Sam's bitching at him to eat something), and his immune system really isn't up to dealing with flu season...

draw my lines in the sky
https://archiveofourown.org/works/2832179
rompt: Dean has an eating disorder. Sam and Cas know about it, but they're pretty busy with their own lives, and they don't realize quite how bad it's gotten (spoilers: rehab bad).

settle down my shivered bones
http://a-biting-smile.livejournal.com/920.html
Sometimes John hunts without his boys, and sometimes he stays gone too long. His sons come up with a way to cope. It's not necessarily pretty, but it's what they do.

the next time it happens
https://www.fanfiction.net/s/4482425/1/The_Next_Time_It_Happens
Dean can't have a problem can he? Just because it's happened once or twice doesn't mean anything. Anyway, only chicks get eating disorders don't they? They certainly don't happen to people like him. Right?

this hoodie-time tag also has a lot of eating disorder!dean http://hoodie-time.livejournal.com/tag/eating%20disorder

Not OP, but this list is awesome!