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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.
Dr. Klaper had mentioned during our consultation that it was safe to water fast for up to 5 days medically unsupervised. The True North clinic and Dr. Fuhrmanâs clinic typically do much longer supervised fasts 10-21 days for chronic conditions. In a nutshell, hereâs what water fasting will do for the body. By restricting all food and drinking water only, it forces the body into a state of ketosis. Women typically take about 48 hours and men 72 hours for their bodies to make this physiological shift.