I was diagnosed with type II in my mid thirties. Diabetes runs in my father's side of the family.
Fasting will have no impact except on a simple blood glucose test. If they did an HB A[sub]1[/sub]C(Hemoglobin A[sub]1[/sub]C) test, the doc will have an idea of your glucose levels over the last few months--fasting or not fasting will have no impact on this test.