Insatiable: The Compelling Story of Four Teens, Food, and its Power by Eve Eliot

Samantha, Hannah, Jessica, and Phoebe all have problems with food and eating. The stories are written as fiction, but the girls' situations are all too real? Why is it that the main characters are all girls? Don't guys have problems with eating disorders, too?
I found a link online to an interview of the author, Eve Eliot, that might add some background to a discussion of the book.

Crank by Ellen Hopkins

The author writes that this work is fiction, but it is loosely based on her own daughter's story. Please read the "author's notes" before you begin. The whole story is told with poems so it is easy and short to read. The hard part is following Kristina's path to self destruction. Crank, also know as crystal meth, is called The Monster in this book. Kristina starts using The Monster on a visit to her absentee father. The slide from there is all downhill. Is there a point in the book when Kristina could have turned back and prevent what happened?