Some people notice that their blood sugar readings are higher in the morning, even before eating. Because this reading is taken after fasting overnight, it may seem unexpected.
Several natural physiological processes can contribute to this pattern.
The Body’s Early Morning Hormone Activity
In the early morning hours, the body releases hormones such as cortisol and growth hormone. These hormones help prepare the body to wake up and become active.
Part of this process involves signaling the liver to release stored glucose into the bloodstream. This natural rise in glucose can cause morning readings to appear higher than expected.
Overnight Glucose Regulation
During sleep, the body continues to regulate blood sugar. Depending on individual metabolic patterns, the balance between insulin activity and glucose release may vary.
For some individuals, this balance may lead to slightly elevated fasting readings.
Late-Night Eating
Eating late in the evening may also influence morning readings. If digestion continues into the night, glucose levels may remain elevated longer than expected.
Meal composition and portion size can also affect overnight patterns.
Looking at Trends Instead of Single Readings
A single morning reading does not necessarily reflect overall patterns. Reviewing fasting levels across multiple days may provide better context.
Comparing fasting readings with post-meal readings and long-term averages such as HbA1c can help create a more complete picture.
For additional context, see our guides on:
This article is for informational purposes only and does not replace professional medical advice.