Kelly in response to your query! My husband has type 2 diabetes dx 84 . He is on insulin, 30units am 30 pm. His Parkinsons was not diagnosed til 2+yrs ago. He began sinemet at that time. We have seen no change in his glucose levels due to the sinemet. Stress and infections, etc are the things that seem to have a great deal of bearing on his blood sugars. Hope this wee bit of info helps. Of course as we all know each persons system reacts differently. Good luck! JuanitaCG for George 73 dx 2+yrs