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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.
How to fast. One popular method of IF is the 16/8 fast, meaning you fast for 16 hours every day and restrict eating to an eight-hour window. For example, if your last meal was at 11 p.m., you wouldnât eat until 3 p.m. the next day. But this method of weight loss on its own may not be as effective without exercise. You may need to fast for three to four weeks before you see measurable results.