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ForumsMetabolic Health & DiabetesType 1.5 diabetes (LADA) and GLP-1 — anyone have experience?

Type 1.5 diabetes (LADA) and GLP-1 — anyone have experience?

marcus_mpls Thu, Mar 5, 2026 at 12:04 PM 12 replies 878 viewsPage 1 of 3
marcus_mpls
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Minneapolis, MN
Mar 5, 2026 at 12:04 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.

Because it is glucose-dependent, this class carries a low intrinsic hypoglycaemia risk on its own — the risk arrives when it is combined with insulin or a sulfonylurea, which usually need reducing.

What I am after is why A1C lags the way it does, and what to look at in the meantime if you want to know sooner.

If the honest answer is that nobody knows, that is a useful answer and I would rather have it.

20 15bbq_ray_KC, oliver_london, tane_welly and 17 others
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Dr.RaviCardio
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Mar 5, 2026 at 1:16 PM#2
marcus_mpls 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.

My labs after 3 months on glycaemic control: A1C 5.9%, fasting glucose 79 mg/dL, fasting insulin 4 uIU/mL. My endo says these are "textbook perfect."

For context, my baseline A1C was 7.3% and fasting glucose was 134 mg/dL. The improvement has been dramatic and consistent.

19 14anna.melb_AU, mark_tokyo, hans_munich and 16 others
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MariaRD
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Mar 5, 2026 at 2:28 PM#3
Dr.RaviCardio said:
My labs after 3 months on glycaemic control: A1C 5.9%, fasting glucose 79 mg/dL, fasting insulin 4 uIU/mL.

Glycemic variability as the key metric for glycaemic control success: my coefficient of variation (CV) on CGM dropped from 40% 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 5, 2026 at 3:28 PM
18 13maria_elpaso, anders_CPH, Dr.NutriCornell and 15 others
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jennifer_SEA
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Mar 5, 2026 at 3:40 PM#4
marcus_mpls 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.

Second this. I had assumed I was the exception until I read this.

Last edited: Mar 5, 2026 at 9:40 PM
17 12jim_asheville, matt_MKE, Dr.ReproEndo and 14 others
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Dr.MetabolicMD
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Mar 5, 2026 at 10:37 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.

16 11GenomicsKate, Dr.ObesityMed, HealthEcon_DC and 13 others
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