I guess you will have to make up your own mind. I can just give the few examples I know:

My husband is AB, he can eat anything without gaining weight or having any health problems.

A girlfriend is B, she went on Atkins for quite awhile and lost nothing. Went to a naturalist who put her on a different diet, not only does she look better she feels better than she has in years.

I am type O, according to blood type I will feel better with restricted carbs and that is true. And if I go down to Atkins inductions levels, I lose weight very quickly.

My sister and daughter are both type O's and they both have trouble with carbs too.

The basic theory is this: each blood type came upon the earth at different times and therefore can not tolerate different things. Type O is supposed to be the oldest and that is why they have trouble with any foods to do with agriculture...and on down the line until you get to type AB, which is the newest and supposedly can eat anything without trouble.

Good luck on your new beginning!