Blood Type Diet

No credible peer-reviewed evidence supports the idea that different blood types produce different digestive responses to food. The blood type diet's claim that blood type influences personality, emotional tendencies, and behavior has no scientific basis. The scientific research supporting the blood type diet is extremely weak to nonexistent. The book Eat Right for Your Blood Type has sold over ten million copies and presents itself as a scientifically rigorous system. Perceived improvements from blood type diets result from replacing processed foods with whole foods, not from matching food to blood type. All four blood type dietary variations eliminate significant amounts of junk food, which is what produces observable results. Blood type differences relate to immune system variation, not to digestive enzyme differences. The improvements people experience on the blood type diet are attributable to eating cleaner, not to any blood-type-specific mechanism.