I am counting myself very lucky as I've had spectacular success in lowering my Hba1c. It was 13.5 when I was first diagnosed with Type 2 six months ago. Last week it was 5.5. I can't take credit for doing anything special. I just cut carbs drastically and increased gentle exercise. Of course, the Metformin I was put on must take a lot of the credit, I think!
I used to be really bad, munching on chocs and lollies for hours every night while watching TV. My first step was to cut them out, replacing them with maltitol /xylotol /stevia sweetened treats. Then I cut down on the savoury carbs as well. I have always tried to eat the "better" carbs, anyway, like multigrain bread and basmati rice, so I just cut down the quantities of these. I've found my sweet tooth has diminished a lot, probably because the new treats are not quite as tasty as the old ones!
Now that I'm over the spinal surgery I had in late June, (Fusion of L4/5 and laminectomy) I am walking my dogs most days and increasing the distance as well. I have lost 6 kgs.
One suggestion I have is to buy one of those new "Soup Mate" devices that makes delicious soup in 20 minutes. You just chop your veggies into large chunks, top up with liquid stock and press start. It cooks and blends as it goes. I've never eaten so many healthy veggies! You can invent your own combo's but I use celery, leek, pumpkin, spinach, carrot, mushrooms, red capsicum and garlic. A blob of cream blended through adds a creamier texture. Delicious and so healthy.