I try to give all books a chance...some I go back to again and again, this one was just a difficult read...I did manage to get to the ending but suppose I am as baffled as you. I did not enjoy this book...at all!
Was it just the ending? Your feelings on the rest of the book/expectations from author?
I thought the book captured a lot of the mundane misery of being fat really well; the author told a good story. But I didn't know where on earth she was going with the ending. I've hidden the book now! I didn't want teenage DDs to come across it as its a bit dark and the protagonist has little self respect, so I can't even quote it to you - it was something about knowing she could change everything. But she'd seemed at the mercy of the fates, as if she felt powerless to change anything but rather had to just go along with everything.