I've read most of the book. It does offer hope for the obese. More than that it constitutes a sober warning never to become obese. It cites studies that show that when obese people lose weight neither their hunger nor their satiety return to pre-weight loss levels, not even after ten years!
Of course this doesn't mean you can't keep the weight off. But it is what it is.
I do think it's off-base where it gets into food recommendations.