I think you should! Maybe it could help some people relax about their weight. I know that a few years ago when I was about 13 I went through disorder after disorder. If I would've had a story like you want to write I probably wouldn't have. It's an amazing idea.
Thanks for the comment on my story :D I've done all of that too. Also, I'm about like that. I don't look fat from the outside but my belly pokes and I can grab the rolls. I'm glad that you commented.
http://www.mibba.com/forums/topic/post/10045903/#10045903