I have recently come acrossa book called..Eating Right for your Blood Type by Peter J. d'Amamo
It explains why there are different blood types, and what foods are good, neutral and bad for each blood type...(something I had never thought of)...The food choices are enourmous, food you can buy in any store, so it isn't some exotic thing...also discusses, high blood pressure, weight loss, and the causes of stress and how dangerous it is, especially over a long period of time
although I don't think its the miracle cure for everything, I think it can help alleviate alot of the medical problems we have today,
I found it quite interesting...and here is the link to it.
http://www.scribd.com/doc/208044/dAdamo-Peter-J-Eat-Right-For-Your-Type-Blood-Groups?ga_related_doc=1