The Blood type diet is very popular in Italy under the name
La dieta gruppo sanguigno del dottore Mozzi
New Study Debunks Blood Type Diet (12/2020, pcrm.org)ABO blood types benefit similarly from plant-based diet, according to research published in the Journal of the Academy of Nutrition and Dietetics
Blood type was not associated with the effects of a plant-based diet on body weight, body fat, plasma lipid concentrations, or glycemic control.
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Blood Type Is Not Associated with Changes in Cardiometabolic Outcomes in Response to a Plant-Based Dietary Intervention (12/2020, jandonline.org) Blood type diet (Wikipedia)