Scientific Criticism
The Blood Type Diet has met with criticisms for many different reasons, some of which have been addressed publicly by D'Adamo. A recent scientific review concludes that no scientific evidence exists to support the Blood Type Diet theory and calls for properly designed scientific studies to address it: "No evidence currently exists to validate the purported health benefits of blood type diets. To validate these claims, studies are required that compare the health outcomes between participants adhering to a particular blood type diet (experimental group) and participants continuing a standard diet (control group) within a particular blood type population."
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