To be honest with you, I thought this book was going to be about anorexia, not about an overweight kid, but that's just because I didn't read the blurb on the back (I hardly ever do the weeks that Alex picks. I like to be surprised.)
But to be honest, I think obesity, and how it effects the KID, should be addressed. We're so concerned with kids and their weight and the health issues associated with it, we're not thinking about the kid, and what's going on with them, and how their being treated and if they're depressed and that maybe, just maybe, their obesity isn't just because they like to eat.
I think Lange does a good job of addressing the issue and really making a point, showing you the problems obese kids face, and showing you that they are people, just like everyone else. Like most problem novels, she shows us something that we've known all along; kids are cruel. Fall in with the wrong set of them, and they're only going to make your life worse.
I like the ending because while it does have a little bit of the "everything wrapped in a neat bow" ending, it also has a log of the "things are really still screwed up and not fixed."