Aajonus's first book was a little too New-Agey for my tastes. This, his 2nd book, is however OUTSTANDING. It contains numerous references to various scientific studies and reports, which I have seen referred to in New Scientist magazine among other sources. The previous book neglected this aspect to a certain extent.
The beginning and end of the book deal with the theory behind the diet, demolishing the irrational concerns of society, such as regards parasites and bacteria, while the middle part deals with recipes and the like.
All in all, I have to say, that I have tried numerous other diets out there(Palaeolithic Diet, Vegetarianism, Raw Vegan, Hay Diet,Instincto, Atkins, "balanced diet" etc.) but the Primal Diet is the only diet which actually restored my health. This book is a must-read for anyone who is interested in improving their energy levels or in curing their long-term health problems.
I would like to add that my former (very serious) health problems were only got rid of completely once I switched to a fully Raw, Palaeolithic variation of this Primal Diet:- I had to eliminate raw veggie juice and all raw dairy from my diet(like many RPDers I have a very strong food-intolerance/allergy towards raw dairy), reduce drastically consumption of raw honey, raw fruit, and raw (solid) veg, to minimal amounts, and eat mainly (raw) organ- meats(especially high-fat ones like bone-marrow/suet/tongue etc.), glands and fatty muscle-meats in place of overly lean muscle-meats. Combining this modification with all other aspects of the Primal Diet, such as "high-meat" etc., helped cure a number of long-term health problems. I also found that doing IF(Intermittent Fasting) helped greatly to improve energy levels.