I used to work in the Entertainment section at a Target....and was in charge of the books. I saw that GEM and had to have it.
I use it a lot as an example for clients curious on how to eat for their body types. For instance most people don't even know what it means when I ask if they want to figure out what type of oxidizer they are.
The exercises are specific for certain muscles and to fix certain issues you don't like about your body. As in they train muscles to get a rounder booty....basically you don't want to do a million squats if you don't want to grow your bottom
I recommend that book, and that program. It seems to make a lot sense to me, and while I haven't gotten around to following the diets listed or the exact workout regimen *I tend to make my own workouts up* I respect the amount of knowledge and care that went into them.
Before you BUY the book be aware that the 30 day cut challenge is for those last pesky pounds, I don't know the name of it but she has another book for more serious weight loss