Marker · Educational ranges, not diagnosis
Fasting glucose
Also called fasting blood sugar, FPG.
Glucose in the morning after an overnight fast. A single day, not a three-month average.
Read this first
- Coach, not doctor. Aaron Cuha is a coach, not a doctor. No clinical credential is claimed for him, or for these pages. A number on a panel is a conversation starter with a clinician, not a DIY diagnosis. Nothing here is a prescription, a protocol, or a reason to start or stop a medicine. Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.
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Why a longevity audience asks
It is the other half of the owner's berberine trigger, and it is the number a clinician uses beside A1c. One high morning does not make a diagnosis.
How a coach reads it
Clinicians often treat under 100 mg/dL as the usual fasting conversation range, 100 to 125 as impaired fasting glucose, and 126 and above on more than one day as a diabetes conversation. Educational, not a diagnosis. Convert mmol/L by multiplying by 18.
Units on this page: mg/dL, mmol/L
When it is low
Low fasting glucose can be a medicine effect, a long fast, or something that needs a clinician the same day if you feel unwell.
When it is high
Means the overnight set-point is high. Food, training, sleep, alcohol, and medicines move it. A capsule is not the first lever.
Easy ways to misread it
- Coffee, a late meal, poor sleep, and steroids can lift a single morning.
- Do not pair this number with a non-fasting draw and call it fasting.
What to ask a clinician
Ask for a true fasting glucose, timed with HbA1c. Say what you took that morning.
Related supplements
Related when-playbooks
Conversation ranges on this entry are named as clinician or owner ranges, not as a trial result invented for the page. Related compound pages carry the trial record.