You can find out on a little home kit. Not sure where my family got them though. They were on a kick of “eating for your blood type” and I eat exactly the opposite of what my bloodtype is supposed to crave. O’s are supposedly suppose to crave and eat more meat that others and can pretty much eat more of whateer they want….I am not an O. Supposedly my blood type is supposed to be a fruit and veggie person and while I’m not against all that I so eat like I’m an O blood type by choice.