I have been a diabetic for 10 yrs. Take 3 insulins and 2000mg Metformin a day. Before pre-op, my blood sugars stayed very high...200-300. Once I started the pre-op diet, BG's dropped, sometimes even too low. Now that I have been banded for 3 wks, I take less insulins and metformin. My morning BG's are usually around 120-150. The Dietician (also a Diabetes nurse) said that's ok.
The more weight loss and exercise we do throughout our journey, will determine how quickly we can kick these meds to the curb!
Good luck!!