<P> The blood type diets are fad diets advocated by several authors, the most prominent of whom is Peter J. D'Adamo . These diets are based on the notion that blood type, according to the ABO blood group system, is the most important factor in determining a healthy diet, and each author recommends a distinct diet for each blood type . </P> <P> The consensus among dietitians, physicians, and scientists is that these diets are unsupported by scientific evidence . </P>

Who came up with the blood type diet