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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.
Fasting from 8 pm to 12 noon â for example â equals 16 hours of fasting. Of course there are many other variants of intermittent fasting, but this 16:8 method (16 hours of not eating, 8 hours of eating during a day) is the one I recommend as a first option.Itâs effective, easy to do and does not require counting calories. You can do a 16:8 fast as often as you like. Fasting for 24 hours (often dinner â dinner) once or twice a week. 2  Effective and can be surprisingly easy to do, especially on an LCHF diet. 3  The 5:2 diet. 4  Eat as much as you need to feel satisfied 5 days of the week and then eat calorie-restricted on two days (500 calories per day for women, 600 calories for men).