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A study of more than 80,000 women has uncovered different risks of developing type 2 diabetes associated with different blood groups, with the biggest difference a 35 percent increased risk of type 2 diabetes found in those with group B, Rhesus factor positive blood compared with the universal donor group O, Rhesus factor negative.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/g1eb_rJDROU/141218210021.htm