My mother died from complications due to TypeII Diabetes. When I finally got sober from the shock, I started looking for information on diet for people afflicted with or people borderline, and I was appalled at all the conflicting information. I'm not just talking about John Doe, MD, but "reputable" medical institutions.
The only things I've seen work in real life are to lose weight (and it doesn't really matter how, it's a matter of getting rid of 50 pounds as fast as possible) and to "move slowly" for long periods of time. Otherwise, the medical community is divided on low carb vs USDA diet and will just pump meds into the patient.