I listened to the audio version of this and it is well-done and debunks many of the fad diets that have abounded and are still around. The author does not deny that there are some people who do have celiac disease and there are also some people who have a sensitivity to gluten. However, that is a small amount compared to the amount of people who have jumped on the gluten free because it will cure everything bandwagon. He points out that if a diet begins with someone's story about their awful health problem(s), followed by a claim that this diet cured not only that, but can cure a huge variety of problems like autism, brain fog, adhd, digestive disorders, skin problems, headaches, cancer, heart disease, and more, it is very likely to be, like snake oil was, a fad that is meaningless. He points out that many people who claim to feel better and lose weight after adopting a specific diet - whether it be gluten free or paleo or whatever, are also no longer eating as much fast foods and are cooking their own foods, which are healthier than the fast foods that they once ate. His book points out many things to think about when it comes to the field of health and diet.