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Evidence-based GLP-1 & peptide discussion since 2023
ForumsMetabolic Health & DiabetesFasting insulin levels — looking for input

Fasting insulin levels — looking for input

PeptideChemSF Sat, Apr 26, 2025 at 1:58 PM 53 replies 2,039 viewsPage 1 of 11
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PeptideChemSF
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Apr 26, 2025 at 1:58 PM#1

A1C went from 7.4 to 5.6 over nine months and my prescriber was more interested in the fasting insulin, which I did not expect.

The question I want answered is why A1C lags the way it does, and what to look at in the meantime if you want to know sooner.

Not looking for reassurance. Looking for the part I have got wrong.

19 14steve_okc, dave_SLC, FDA_TrackerJim and 16 others
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LibrarianMeg
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Apr 26, 2025 at 2:15 PM#2
PeptideChemSF said:
A1C went from 7.4 to 5.6 over nine months and my prescriber was more interested in the fasting insulin, which I did not expect.

Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 39% to 22%. Target is <36%, with <30% being ideal.

Why this matters more than average glucose: large glucose swings cause oxidative stress, endothelial damage, and promote advanced glycation end-products (AGEs). A flat glucose line at 95 mg/dL is metabolically healthier than oscillating between 60 and 160, even if the average is the same.

Last edited: Apr 26, 2025 at 4:15 PM
18 13PharmD_Rodriguez, julia.endo, JessicaM_2024 and 15 others
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VanRx_Mike
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Apr 26, 2025 at 2:32 PM#3
LibrarianMeg said:
Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 39% to 22%.

PCOS success story with glycaemic control: as someone with polycystic ovary syndrome, this medication has been transformative beyond weight loss.

After 10 months: periods became regular for the first time in years, testosterone levels normalized, acne cleared significantly, and — unexpectedly — I got pregnant naturally after 4 years of trying.

GLP-1 agonists address the insulin resistance at the root of PCOS. For PCOS patients, this isn't "just" a weight loss drug — it's treating our underlying metabolic dysfunction.

17 12Admin, Dr.Martinez, mike_mod and 14 others
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SallyK_inj
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Apr 26, 2025 at 2:49 PM#4
PeptideChemSF said:
A1C went from 7.4 to 5.6 over nine months and my prescriber was more interested in the fasting insulin, which I did not expect.

This matches mine closely enough to be worth saying so out loud.

16 11tane_welly, Dr.PathRoch, mona_PHX and 13 others
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Dr.PainCLE
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Apr 26, 2025 at 4:21 PM#5

From the other side of the consultation, briefly.

Patient selection optimization for glycaemic control: emerging predictive biomarkers for GLP-1 agonist response include:

BiomarkerAssociationEvidence Level
Baseline BMIHigher BMI → greater absolute weight lossStrong
Fasting insulinHigher insulin → better responseModerate
GLP1R gene variantsrs6923761 → variable responsePreliminary
Baseline hsCRPHigher CRP → greater CV benefitModerate
Early weight loss (4 wk)≥3% at 4 wks → strong predictor of ≥10% at 68 wksStrong

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.

15 10amy_econ_NJ, bbq_ray_KC, oliver_london and 12 others
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