This book is considered to be one of the most controversial diet books on the market and it certainly raises a lot of interesting issues that are normally avoided in the diet industry. Although a lot of people believe that metabolism and genetic predisposition can lead to weight problems, the author of this book believes that eating the wrong foods for your blood type may be the root of a weight problem. This is an interesting concept and unfortunately, there is not a lot of evidence around to support these claims.
The author does state that research was performed to come up with this plan, but facts are never cited and this research is never shared. This raises some major red flags right from the start. It's one thing to say that a diet can do something, but if it can't be proven, it's just irresponsible to make these kind of claims. While there are thousands that swear by this diet, there is a general lack of clinical proof in place to back up the author's claims and that is quite frankly, not good.
The book does not focus on lifestyle changes or the quest to get not only fit but also healthy. Instead, it claims that your blood type determines what kind of foods you can eat. For example, those with a type A blood type will need to avoid meat, dairy, tomatoes and peppers from their diet. This is no easy task and will take a huge level of long term commitment to keep weight off. The other blood types have similar restrictions, but they do vary a bit. For example, O Types are allowed to eat meat, but no carbs or dairy. The diets are just so extreme that they make even Atkins look easy.
The only real good thing that we can say is that the book makes it pretty clear what you can and cannot eat. Some people may find this refreshing since it really removes any question about grey areas. However, it is just not healthy to completely remove whole food groups from your diet. For example, if you completely stop eating both meat and cheese, you're going to be missing a significant amount of protein from your diet. Your body needs protein to function properly and without it, you can have some serious health problems.
In order to lose weight the healthy way, it's best to find the right balance of carbs, protein and fats. All are essential and should never be completely eliminated from a diet. When you do that, you end up feeling deprived and the cravings can be very intense since your body is trying to tell you that it is drastically low on protein or carbs.
We simply cannot recommend this book due to the fact that there is no research available to back up the author's claims. The suggestions are not healthy and adherents could be physically harming themselves by following this diet.
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