A relative of mine developed diabetes and was on medication. His physician recommended weight loss, and also had him on meds for high blood pressure & a couple other things as well, I believe. We'd talked many times about diet primarily because I was a vegetarian trying to work into a vegan lifestyle and, while he was neither, knew the benefits of adhering to a more plant-based diet. He's cut out most all red meat and cut down on meat consumption in general since. There's also been an increase in veggies and decrease in sodas & processed junk foods, but he still enjoys desserts and whatnot occasionally. As a result, his blood tests have come back much better and his doctor has been able to remove him off most medications!!
I myself do not have diabetes, but had a few major health issues my entire life that were primarily GI problems. I've had more surgeries in my 29 years than I have fingers and toes.. and somehow after changing to my current way of eating I have had NO surgeries. It's been 8 years since the last one, after which I made the change. Maybe it's completely coincidental, or maybe there's something there.. My doctors don't have an answer but say to keep doing what I'm doing, haha.
Anyhow... here's a link to diabetes-related blog entries by Jack Norris R.D. that can possibly give you more helpful information -
http://jacknorrisrd.com/?cat=15You can find lots of really great-tasting recipes online, too. I recommend Happy Herbivore to everyone, but there tons of other sites. My daughter eats vegan when she's with me, as does my meat-eating boyfriend while we're home, and they both really like the things from that site. My daughter has even recently learned to like *gasp* brussel sprouts and kale! lol