Why is my fasting sugar high when I eat nothing at night?
High fasting sugar in the morning comes from the liver, not from anything you ate at night. In the early morning the body releases hormones that tell the liver to push out stored glucose, the dawn phenomenon. In insulin resistance, that push overshoots.
A late heavy dinner, poor sleep, or a medicine dose wearing off overnight can add to it.
Log sugar at bedtime and on waking for a week; the pair tells your doctor whether it is dawn hormones or evening habits. Either way it is a solvable pattern, not a mystery.
Source: American Diabetes Association, Standards of Care in Diabetes
See a doctor promptly if
- Excessive thirst, frequent urination, blurred vision or unexplained weight loss. These suggest diabetes and need testing, not tracking
- Sweating, shakiness, palpitations or confusion a few hours after eating that resolves with food, especially if repeated
- A fasting glucose of 126 mg/dL (7.0 mmol/L) or more, or an HbA1c of 6.5 percent (48 mmol/mol) or more on repeat testing
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Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
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