It's a fad diet. You may lose weight - fad diets are actually pretty good at this! But there's little evidence that blood type plays an important role in digestion or nutrition. See this article in Quackwatch:
http://www.quackwatch.org/04Consumer...d%27adamo.html
There are lots of reasons to eat less meat - both for health and for the environment - but blood type really isn't one of them. The proteins found in meat exist as highly complex, folded chains of amino acids that are unfolded ("denatured") by stomach acids. This unfolding process exposes chemical bonds that are then cleaved by gastric and pancreatic proteases. The constituent amino acids are then actively transported across the small intestine and carried away by blood vessels lining the gut.
So by the time meat protein comes in contact with the blood, it has already been broken down into amino acids. And an amino acid is an amino acid, whether it came from a soy bean or a cow.
So why do we want to eat meat sparingly if the amino acids in meat protein are essentially the same as in vegetable proteins? It's the saturated fat and cholesterol that tags along with meat. However, there's no evidence that hypercholesterolemia or hyperlipidemia are at all affected by blood type.
Now there IS somewhat of an association between blood type and risk of heart attack, with type Os having a decreased risk. But this has nothing to do with how food is digested. It most likely has to do with a blood clotting factor called Von Willebrand Factor - type O seems to have less of it.
Blood type is determined by immunologic markers that sit on the exterior of red blood cells. Blood type has nothing to do with stomach acidity nor with proteases. It has nothing to do with amino acid transport. Or fat emulsification and absorption, nor carbohydrate digestion.
Bottom line - fad diets come and go; but a diet that's rich in vegetables and fruits, with whole grains and sparing in meats and saturated fats, characterized by moderation and variety is going to be the best for long term health and weight control. It's also the most delicious.
I was thinking of turning vegetarian, and surprisingly - I should be a vegetarian, according to this book. lol. 
Let us know how it goes and if you feel a difference!
Each blood type has a catagory in ancestry, and each blood type determines the way we absorb nutrients. 
Good on you Belowen keep at it 
I'll be joining you after tomorrow if not today.. I'm so tempted to just drive down to my nana's to pick up this book now 
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