Fasting glucose improved within weeks and my HbA1c barely moved for three months, which I now understand and did not at the time.
The narrow version of the question is why A1C lags the way it does, and what to look at in the meantime if you want to know sooner.
Numbers rather than impressions, if you have them.
sarah_nash92 said:Fasting glucose improved within weeks and my HbA1c barely moved for three months, which I now understand and did not at the time.
My labs after 6 months on glycaemic control: A1C 5.4%, fasting glucose 84 mg/dL, fasting insulin 5 uIU/mL. My endo says these are "textbook perfect."
For context, my baseline A1C was 8.3% and fasting glucose was 129 mg/dL. The improvement has been dramatic and consistent.
julia.endo said:My labs after 6 months on glycaemic control: A1C 5.4%, fasting glucose 84 mg/dL, fasting insulin 5 uIU/mL.
Patient selection optimization for glycaemic control: emerging predictive biomarkers for GLP-1 agonist response include:
| Biomarker | Association | Evidence Level |
|---|---|---|
| Baseline BMI | Higher BMI → greater absolute weight loss | Strong |
| Fasting insulin | Higher insulin → better response | Moderate |
| GLP1R gene variants | rs6923761 → variable response | Preliminary |
| Baseline hsCRP | Higher CRP → greater CV benefit | Moderate |
| Early weight loss (4 wk) | ≥3% at 4 wks → strong predictor of ≥10% at 68 wks | Strong |
The 4-week early responder criterion is the most clinically actionable: if you haven't lost ≥3% by week 4 at a therapeutic dose, discuss optimization strategies with your provider.
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Shop Reference Standardssarah_nash92 said:Fasting glucose improved within weeks and my HbA1c barely moved for three months, which I now understand and did not at the time.
Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.
From the other side of the consultation, briefly.
Insulin sensitivity test (HOMA-IR) on glycaemic control — arguably the most important metabolic marker most people aren't tracking:
HOMA-IR = (fasting insulin × fasting glucose) ÷ 405
My numbers: Baseline HOMA-IR = 4.8 (insulin resistant) → Current = 1.4 (insulin sensitive)
Anything above 2.0 indicates insulin resistance. The goal is below 1.5. GLP-1 agonists address the root metabolic dysfunction, not just the symptoms. This is why they work so much better than calorie restriction alone.