Home HealthTopics Health Centers Reference Library Research
Join us on Facebook Join us on Facebook Share on Facebook

Quality Health Care and You - Diabetes

Not sure of glucose reading?



Question: Being on a low carbohydrate high protein diet is it possible to get a higher glucose reading in the morning after getting a lower reading at night before bed and having fasted for 10 hours? I have not been diagnosed as a diabetic.


Yes, it is possible that the morning glucose reading could be higher than the night before, even after having fasted for 10 hours. The body’s glucose is maintained 24 hours a day through several mechanisms; the actual glucose value will normally fluctuate from 90 to 110 mg/dl daily, even in a fasting state. The liver produces glucose during times of fasting, and during prolonged fasts (24 hours or longer), fat is broken down for energy.

Diabetes is defined as having a fasting glucose of 126 mg/dl or higher on two different occasions, or a level greater than 200 mg/dl with symptoms (extreme thirst, urination frequently, extreme hunger, with weight loss). An A1c is a 3-month snapshot of one’s glucose 24 hours, 7 days a week – normal is less than 5.8%. You can ask your doctor to do an A1c if you are concerned about having diabetes.

For more information:

Go to the Quality Health Care and You - Diabetes health topic, where you can:

Response by:

W. Fred Miser, MD W. Fred Miser, MD
Professor of Family Medicine
Director of Ohio State Medicine Residency Program
College of Medicine
The Ohio State University