I have been Pre for the last 13 years. My fasting BG and my A1c numbers are in the non diabetic range. The only problem is that my fasting BG timings are all messed up or rather strange.
I fast for 8-9 hrs, I start my fasting from 3pm or 4pm for about 9 hrs. At 3-4am I get up and have breakfast. I am not sure if day time fasting is okay compare to night time fasting.