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Evidence-based GLP-1 & peptide discussion since 2023
ForumsMetabolic Health & DiabetesFasting insulin levels — 12 month update Page 2

Fasting insulin levels — 12 month update

oliver_london Mon, Mar 23, 2026 at 10:53 PM 7 replies 660 viewsPage 2 of 2
kate.chem
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Mar 24, 2026 at 11:38 AM#6
oliver_london said:
HbA1c reflects roughly three months of average glycaemia weighted toward the most recent weeks, which is why repeating it at six weeks tells you very…

Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 35% 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: Mar 24, 2026 at 2:38 PM
3 23steve_okc, dave_SLC, FDA_TrackerJim
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lucas_SP_BR
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Mar 24, 2026 at 4:41 PM#7

Following on from Dr.MetabolicMD — and this may be the naive question:

How long did you give it before you decided it was working?

2 22Dr.ObesityLA, NurseKim_ATL
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GenomicsKate
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Mar 24, 2026 at 9:44 PM#8
kate.chem said:
Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 35% to 22%.

Fasting insulin is the lab my functional medicine doctor cares about most for glycaemic control: it's a much earlier marker of metabolic dysfunction than glucose or A1C.

My fasting insulin: 27 → 15 → 5 uIU/mL over 9 months. Target is <7. By the time your fasting glucose is elevated, your insulin has been elevated for YEARS trying to compensate.

Ask your doctor to include fasting insulin in your bloodwork panel. It's cheap (~$20) and incredibly informative.

1 21MarkLI_maint
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oliver_london
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Mar 25, 2026 at 2:47 AM#9
kate.chem said:
Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 35% to 22%.

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

After 7 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.

50 20jason_paloalto, Dr.LeslieOBGYN, MikeNYC_runner and 47 others
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Dr.KarenChen
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Mar 26, 2026 at 3:02 AM#10
GenomicsKate said:
Fasting insulin is the lab my functional medicine doctor cares about most for glycaemic control: it's a much earlier marker of metabolic dysfunction…

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.

4 2sarah_nash92, FitDadDave, RunnerRach and 1 other
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