Six months ago my blood glucose level was getting too high,,,close to pre-diabetic levels. The normal range (at my clinic) is 70-100. My level was 98. Sometimes I go on sugar binges,,,lots of pastries, etc. So I started watching what I was eating, and my latest test last month I got my glucose down to 74.
My understanding is that fasting levels are closer to 100-150 and after a meal may shoot up a hundred points. The body’s endocrine system nicely controls the glucose levels. Even while fasting, the glucose levels may vary by 50 mg/l due to endocrinal secretions into the bloodstream.
If it is never below 150, then you probably need some medication to avoid burning out the pancreas.