I did a 25 hour fast from Saturday 8pm until Sunday 9pm. Complete fast, no food or drink.
I have the 670 system from Medtronic and it worked perfectly, kept my sugar between 90-130 for almost the entire time, with a short period at around 140.
After the fast I had a high carb meal. Bolused well before the meal. About an hour after the meal my sugar was around 180. I got on the treadmill to exercise and my sugar started to spike like crazy. Corrected and corrected to no avail. Sugar hit almost 400, a number I have not seen in many months. Only after about 3 hours did it start to come down, first slowly, then rapidly.
As of this morning, sugars are still not behaving as they normally do. Still getting spikes, still taking longer to bring down the spikes, exercise still not helping bring down the spikes.
Any ideas what might be causing this? Could fasting cause unusual production of glucose by the liver? Ketones?