Fasting Glucose

Fasting plasma glucose is the blood sugar level after at least eight hours without food. It is a simple, widely used snapshot of glucose regulation.

Fasting glucose is a core screening test for prediabetes and diabetes and an early signal of insulin resistance. Paired with fasting insulin, it gives a fuller picture of metabolic health than either alone.

1. 1

   FoundationMetabolic HealthThe best place to understand the major drivers of metabolic disease.
2. 2

   ConditionType 2 DiabetesChronic high blood sugar from insulin resistance
3. 3

   Signal RecordMagnesiumEssential Mineral
4. 4

   Body SystemMetabolismEnergy, blood sugar, and how the body processes fuel.

1. Measure it
2. Understand your result
3. See what raises and lowers it
4. Apply evidence-based interventions
5. Recheck on your review cadence

An orientation to how this topic is typically approached — not medical advice.

Rising fasting glucose reflects the liver and muscles handling glucose less well. It often climbs later than fasting insulin, so a 'normal' glucose with high insulin can still indicate early insulin resistance.

• Fasting blood draw (≥ 8 hours)
• Often paired with fasting insulin for HOMA-IR

Fasting glucose is a long-established diagnostic criterion; its thresholds are standardized and well validated for diabetes and prediabetes.

• ADA Standards of Care in Diabetes
• WHO diagnostic criteria for diabetes

Sources are named authoritative guidelines and scientific bodies. Biomarker pages present established clinical context; calibrated evidence verdicts on specific interventions live in the linked Signal Records.