Very little: There is an enormous amount online about "what to do if you are thus-and-such of a blood type" and it's as fictitious as zodiac signs. The ABO blood group system has very little correlation with common illnesses (other than hemolytic disease of the newborn). Response to a few infectious agents (famously h pylori) varies some. http://bloodjournal.hematologylibrary.org/content/115/23/4635.full.
Answered 1/12/2015
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