This book was recommended to me by a friend whose husband had diabetes, he lost five stones on it - he is Blood Group A, and is fully in control of his diabetes.
Being extremely overweight myself I looked at the book with my daughter, neither of us knew our blood group but we both worked out what we thought we should be by what was written in the book, we checked and Bingo we were both right.
I am an O, the cave man. I was a tea aholic before starting this way of life and drank gallons of black tea. Treat it like being a diabetic, if you are not allowed tea, wheat, pork etc lik me what the heck there are so many other things that you are allowed. This is a way of life that I wont change. By being careful on what you do eat the weight is dropping off , nearly four stones since January, I had tried every other diet imaginable. You can eat so much and the bonus is on day 3 if you are really, really good you get this energy burst. I am full of energy, I thought that my tiredness was due to the excess weight, but it isn't it is due to putting the wrong fuel in, imagine what would happen if you put Diesel in your unleaded Car, it would become sluggish and stop.
I could go on and on I feel like an evangelist, but please give it a go at first sight it isnt easy but work at it, you will soon find meals that you enjoy.