Pankaj Jain Pankaj Jain Asked 6 months ago

Why does blood sugar go up when fasting non diabetic?

My brother-in-law is not diabetic, but when he fasts for his religious observances, his blood sugar actually goes up instead of down. We were quite surprised by this. Why would blood sugar increase during fasting for a non-diabetic person?

5

5 answers

Kavita Devi Kavita Devi Joined Mar 2026 6 months ago
Most liked

Sometimes, even in non-diabetics, the body can release stored glucose into the bloodstream during fasting, especially if there's stress or insufficient sleep. This is the body's natural response to ensure energy supply. Practicing gentle pranayama can help manage stress, which sometimes influences such bodily responses.

Priya Menon Priya Menon Joined Feb 2026 6 months ago

This is something that needs careful attention. While the body does have mechanisms to raise blood sugar during fasting (like glycogenolysis), a significant or consistent rise in a non-diabetic should be investigated. It could indicate insulin resistance, prediabetes, or other underlying issues. Please, get a proper medical evaluation by an endocrinologist.

Powered by

Consult a endocrinologist

Anjali Bose Anjali Bose Joined Feb 2026 6 months ago

I've heard people talk about the 'dawn phenomenon' where blood sugar rises in the morning due to hormone release, even without eating. I'm not a doctor, so I can't say exactly why it happens, but it seems like the body has its own complex ways of managing energy. My personal experience has been that diet and exercise play a big role in overall health.

Rajesh Kumar Rajesh Kumar Joined Jun 2026 5 months ago

As someone with thyroid issues, I know how interconnected hormones are. Your body can release stress hormones during fasting, which can temporarily increase blood sugar. However, if this is a recurring observation, it's wise to get your fasting glucose and HbA1c levels checked by a doctor. Early detection of any metabolic changes is crucial.

Related reads

All articles
Varun Sharma Varun Sharma Joined Jun 2026 4 months ago

The body has a natural process called gluconeogenesis, where it makes its own sugar from stored resources during fasting, so a slight rise isn't always alarming. However, persistent high fasting sugar could indicate insulin resistance. Besides consulting a doctor, ensuring regular exercise and a balanced diet can always help improve glucose regulation. Even a brisk walk daily can make a difference.

Evidence-based health, reviewed by clinicians. Free, weekly.