This book frequently reads like a sales pitch: jokey, folksy, and incredibly repetitive, there is some good information in here, but you'll find a far more thorough review of food intolerances in other books. Contrary to what Virgin says, this really is a diet book. Also, read its admittedly cursory information with care: it isn't cowritten or reviewed by a doctor - those little endorsement blurbs don't count! Also, the book is fairly dismissive of vegetarian/vegan diets, so if avoiding animal products is your thing, this probably isn't the diet plan for you since it strongly resembles Paleo.