What should your fasting blood sugar be?

By Dr. Priyanka Wali

A fasting blood sugar should be less than 100 in order to be considered normal.  A fasting blood sugar of >100 to 125 is consistent with prediabetes.  Fasting blood sugar levels of 126 or greater is diagnostic of diabetes.

If your fasting blood glucose is consistent with prediabetes or type 2 diabetes, we recommend that you speak with your physician.

Learn more about how food impacts your fasting blood glucose.

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  1. Avatar

    What about the dawn phenomenon? I gave up taking my FBG in the morning because between 6-7am it’s always between 85 and 104….but a lot of times over 100. Then after meals (low carb) it’s 100 and even lower sometime. So literally my FBG is sometimes the highest measure of the day. What about insulin of 3.0? Thank you for your help. Oh, and my A1C went from 4.9 (on a vegan diet not low carb) to 5.3 after 14 months on low carb, high healthy fats mostly plant based. (I do eat eggs and a little bit of fish) I’m 57 and fit (exercise 7 days a week, healthy weight, BMI of 19. Can this be because after menopause women may not be as able to handle a strict low carb and high fat diet?


    1. Virta Health

      Robin, here is a link to our post on dawn phenomenon: https://blog.virtahealth.com/dawn-phenomenon/

      For the rest of your questions, I will send them to our scientific team and will share their response as soon as I can.


  2. Avatar

    What is the science on statins / diabetes / and dawn-phenomenon?


    1. Virta Health

      Hi Paul! Have you looked at our post on dawn phenomenon? It may answer your question! https://blog.virtahealth.com/dawn-phenomenon/


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