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Evidence-based GLP-1 & peptide discussion since 2023
ForumsMetabolic Health & DiabetesFasting insulin levels — looking for input Page 2

Fasting insulin levels — looking for input

PeptideChemSF Sat, Apr 26, 2025 at 1:58 PM 53 replies 2,039 viewsPage 2 of 11
Dr.BariatricHTX
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Apr 26, 2025 at 5:53 PM#6
LibrarianMeg said:
Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 39% to 22%.

My labs after 12 months on glycaemic control: A1C 6.3%, fasting glucose 78 mg/dL, fasting insulin 5 uIU/mL. My endo says these are "textbook perfect."

For context, my baseline A1C was 7.1% and fasting glucose was 123 mg/dL. The improvement has been dramatic and consistent.

Last edited: Apr 26, 2025 at 11:53 PM
14 9CarlaRPh_TPA, steph_laguna, fiona_glasgow and 11 others
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TirzTom
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Apr 26, 2025 at 7:25 PM#7
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.

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: 24 → 14 → 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.

13 8tom_AK, josh_phd_bmore, roxy_nash and 10 others
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ingrid_STO
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Stockholm, SE
Apr 26, 2025 at 8:57 PM#8
Dr.BariatricHTX said:
My labs after 12 months on glycaemic control: A1C 6.3%, fasting glucose 78 mg/dL, fasting insulin 5 uIU/mL.

Complete metabolic panel trending on glycaemic control — sharing because comprehensive data helps everyone:

TestBaselineMonth 3Month 6Month 12
Glucose (fasting)1141089086
Insulin (fasting)2016106
HOMA-IR4.53.51.81.3
Uric Acid8.26.45.75.0

The insulin resistance improvement (HOMA-IR) is what my endo focuses on most. Going from 4.5 to near 1.0 is a metabolic transformation.

12 7MikeFit_NJ, InsuranceTom, WendyG_ATL and 9 others
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steph_laguna
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Laguna Beach, CA
Apr 26, 2025 at 10:29 PM#9

A narrower follow-up, since the general answer is now clear:

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

Last edited: Apr 27, 2025 at 4:29 AM
11 6DanielChem_CHI, marco_milano, pam_columbus and 8 others
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PeptideChemSF
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Apr 27, 2025 at 5:49 AM#10
ingrid_STO said:
Complete metabolic panel trending on glycaemic control — sharing because comprehensive data helps everyone: Test Baseline Month 3 Month 6 Month 12…

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 = 5.5 (insulin resistant) → Current = 1.5 (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.

Last edited: Apr 27, 2025 at 9:49 AM
33 6BrianDallas92, labquiet_amy, emily_PDX and 30 others
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