Glucose (Fasting)
Fasting glucose measures your blood sugar after 8+ hours without eating. Elevated levels may suggest insulin resistance, prediabetes, or diabetes.
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What Glucose (Fasting) measures
Fasting glucose is the concentration of sugar in your blood after not eating for at least 8 hours. It reflects how well your body regulates blood sugar when it isn't processing a meal. It's one of the primary screening tests for diabetes and prediabetes.
Normal ranges
Reference ranges may vary slightly by lab. Always use the range provided on your specific test report.
What affects your glucose (fasting) level
- Diet high in refined carbs and added sugars
- Lack of physical activity
- Excess body weight (especially abdominal)
- Stress and poor sleep
- Family history of type 2 diabetes
Foods that may help
High-fiber vegetables
Slow sugar absorption and improve insulin sensitivity
Whole grains (oats, quinoa, barley)
Steady energy release, no spikes
Legumes (beans, lentils)
Low glycemic, high fiber, improves HbA1c
Cinnamon
May improve fasting glucose in some studies
Nuts (almonds, walnuts)
Healthy fats reduce post-meal glucose spikes
When to see your doctor
If fasting glucose is above 100 mg/dL, discuss with your doctor. They may order an HbA1c test to check average blood sugar over the past 3 months. Lifestyle changes can often reverse prediabetes.
Related biomarkers
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Educational content only · Not medical advice