Hey, this isn't at all the fiction you are looking for, but you have been on my mind all day since I read your thread about normal eating and weekend binging, so wanted to share I book I am currently reading...
Addiction: A Disorder of Choice
I am only a little ways into it, and it is a little dry, but I'm liking what I've read so far.
On the fiction front, I just read "Good Enough To Eat", which was recommended by Mandalinn82, which I loved. It is about a woman who has lost 140 pounds and is dealing with life in maintenance.
And, second the art with your son. DSS used to love it, and finger painting is messy but so much fun.