I have tried this "diet" on the advice of a natural health practitioner. I was told to eat a certain way, contrary to what I normally eat which is low carb etc. I felt HORRIBLE! I gained over 20 pounds within a month or so and I am still struggling to get rid of it. I am here now to start all over once again and get myself motivated and in gear!
I know of many people that have tried that eat for your blood type and it did not go well for them, although I am sure it works for some. I think you need to just listen to your own body!