I read the book ages ago, I think I read it when I was in grade 10. At the time I didn't really understand all of it, but I know I made me and my best friends promise to stop eating fast food. ...(Yes, I was always the friend where the rest of them would be like "shit, she's reading something. We wont be able to do anything by the end of the month.")
Anyway...now its a movie!
I used to be really iffy on issues becoming movies, but I guess it's more effective than books...more people will see the movie than those that will read the book.