Eat Right 4 Your Type: The Individualized Diet Solution to Staying Healthy, Living Longer & Achieving Your Ideal Weight

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The author is a naturopath who claims he can heal people through diets designed to fit 4 blood types (A, B, 0, AB). If this were the thesis of this book, I would simply accept the author's word for it. Many non-conventional doctors use different media and methods to convey their healing abilities and, while the real nature of their systems baffles scientific analysis, fact is that they can heal. Unfortunately the author reached great success by stitching a delirious "scientific" theory around his thesis. I'll be expressing only few major critiques.

1) The evidence he presents to support his thesis is 100% circumstantial. About a third of the book sounds like this : "John, who was suffering for this and that, came to my office. After putting him on the right diet, his symptoms reverted or regressed". Circumstantial evidence can be used as a starting point but it cannot be used to prove a theory, nonetheless the author sells his theories as if they were the Gospel
2) D'Adamo states that group 0 is the blood group of hunters-gatherers. The group A are the farmers and the group B are the nomads. Well, this is not true. Go in the data bank and look for yourself. As an example, you'll notice that very many hunters-gatherers (Inuit and Ainu among others) have a lower group 0 incidence than peoples who have been farmers for millennia. The only major hunter-gatherer population fitting his scenario is the American Indian (both North and South). Amerindians were bottlenecked during their migration from Kamchatka to Alaska. Obviously, concepts like "genetic drift" are alien to the author.
3) Nowhere in the scientific literature could one find any of his "studies" he claimed were being wrapped up at the time of publication
4) The auhtor's knowledge of the biochemistry of lectins, albeit seemingly sound to most people, is primitive and incomplete. He is not just trying to keep it simple: he dismisses or ignores everything that may hinder his "truth".
5) For D'Adamo's theory to be valid, food lectins must remain functionally intact through the stomach, the intestine and, in many cases, the cooking process. Moreover they should remain invisible to the immune system. This is frankly hard to believe. The author states that lectins do in fact survive digestion (no prove or literature is presented on this) and completely ignores the host immune reaction.
Again, I am not questioning that D'Adamo may have the ability to heal people, however the "scientific" foundation on which this entire book is based is beyond weak: it is simply delirious.

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