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Rating Newest Oldest. Best Answer: 8 to 10 hours is considered FASTING. You should be testing BEFORE each meal, and then again TWO HOUR after each meal. If you are under control, the FASTING reading (first thing in the morning, before breakfast) should be low-normal, like 80-100.
We're NOT talking about starving yourself for days on end. Simply restricting your daily eating to a narrower window of time of say 6-8 hours, you can reap the benefits without the suffering. This equates to 16-18 hours worth of fasting each and every day â enough to get your body to shift into fat-burning mode.