here is a link to a review WebMD gave the diet:
The most interesting comment is their conclusion -
As for why so many have embraced the diet, Wiley has a theory: "Dieting is one of those things people feel desperate about. ... The blood-type diet sounds more scientific [than some others]."
But it's the very lack of a solid scientific background that rankles most experts.
"If this diet wasn't coming from the whole blood-type approach, I could recommend this," says Grotto, "but the philosophy of blood type is very obscure and lacking in science."