I was diagnosed with T2 diabetes a few years ago. I went to dietitian who prescribed a diet with 60% carbs (I believe its roughly the same as the ADA dietary guidelines). The standard treatment is medication, followed by more medication, then insulin shots.
Frustrated, I read everything I could get my hands on, and found two books that I'd highly recommend: 1) Dr. Bernstein's Diabetes Solution, and 2) Think Like a Pancreas by Gary Scheiner. Dr. Bernstein is notable because he was diagnosed with T1 when it was a fatal condition. He survived, became an electrical engineer and ultimately went on to become an MD. He lobbied the AMA to allow patients to have blood glucose meters, when the AMA wanted them to be restricted to doctors offices.
I stopped listening to medical practitioners and starting experimenting with the foods I ate, using pairs testing with a glucose monitor. There is no question that a low carb diet is the way to go.