It will. Also, OCD isn't something which should be taken lightly.

Only if the effort includes her having to "squeeze" through the door.... but then who's to says she's not just simply wearing the door down.

the only thing your girlfriend is going to loose is hair. it will become a stressful habit.

When she goes outside lock the door. Hopefully this will motivate her to go for a walk. Otherwise, you're down one stupid girlfriend. It's a win-win. (Yes I know OP didn't specify to say it was their front/back/flyscreen/sliding/rotating/French bay door. Deal with it.)

Tell her that if she wants to burn fat she should light an obese kid on fire. That'll do it.

(walks thru doorway 15 times) "Achievement unlocked, 13 calories burned."

that's aggravating. I have a real form of ocd, trichotillomania which makes me pull my hair out resulting in big bald spots. seriously tell her to just work out and stop with the bs

If she's so fat that her sides scrape the door frame when she goes through, then it will probably work. Just have to scrape enough fat off to make it worth while.

She's not the brightest bulb in the box is she? I mean taking a half hour walk everyday with proper diet sounds like a more effective idea.

Umm, run while you can. NOW!!!!