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Type 2 glucose readings fairly steady during a fast

16 hours into my 20 hr fast. Glucose is 107. Seems like my body is producing a good amount of sugar without any food at all.

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Answer

May be glycogenolysis (glycogen -> glucose) and/or gluconeogenesis (protein / fat -> glucose) at this point. The former can supply up to a few thousand calories, the latter keeps going so long as one has tissue to spare, but takes a dip under extended fasting conditions (> ~48 hours), as ketone production and utilization progressively increases. Together they ensure that there’s always adequate glucose supply for those cells that don’t fancy a high-fat diet (lack mitochondria).

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