I too am haplogroup b from New Mexico with 16189C gene and yes I also have a family history of diabetes. I myself have what is termed as prediabetes with blood sugar at about 110. Am working at lowering it. And I have had a couple of episodes with "stress diabetes". Twice I have had the hypERglycemic jitters and have fainted. Apparently we seem to metabolize carbohydrates extremely efficiently needing far less than others do.