I would recommend Ari Whitten's "Forever Fat Loss" as a book on fat loss nutrition.
I don't know all the detailed claims ketogenic diet advocates make, all I know is that sustained low carbohydrate diets are damaging and a very bad idea. They do in fact work for fat loss in the short run, which is why so many people are buying into it.
So the claim that on a ketogenic diet your brain only needs 5% of energy from protein (to make glucose) and the rest from fats and ketones is wrong?