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Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 2:30 am
by TropicStrength
My fasting glucose is 105 mg/dL but my HbA1c is 5.1%. Am I pre-diabetic or is this just dawn phenomenon?
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 3:25 am
by AndeanLifter
HbA1c is a 3-month average. 5.1% is perfect. Fasting glucose can be high due to stress or poor sleep.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 4:10 am
by MedellinMuscle
Get a Fasting Insulin test and calculate your HOMA-IR. That is the gold standard.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 4:55 am
by LatinoBulk
High protein intake can also keep fasting glucose slightly elevated via gluconeogenesis.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 5:45 am
by CaliFlex
Do you take Growth Hormone? That will definitely spike fasting glucose.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 6:35 am
by TropicStrength
No GH. Just a lot of caffeine and high-intensity training.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 7:20 am
by MedellinMuscle
Caffeine can spike cortisol which spikes glucose. Try testing after a rest day.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 8:05 am
by AndeanLifter
Also, check your Vitamin D. Low Vitamin D is linked to impaired insulin secretion.
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 8:45 am
by LatinoBulk
Berberine or Metformin? Anyone using those for glucose management?
Re: Fasting Glucose vs HbA1c: Insulin Sensitivity
Posted: Thu Jan 22, 2026 9:20 am
by TropicStrength
I prefer Berberine. 500mg before high carb meals works wonders.