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c/t2dglp1·posted 2 months ago by u/joaquin_trevino

help me understand T2D, I have read the wiki twice

Discussion Cold Box ×8 The Quiet One ×3

help me understand T2D, I have read the wiki twice. I am not trying to be the "source?" guy. I would just like a source.

Postprandial excursions typically respond earlier than fasting glucose, so the sequence people observe is not a sign that something is not working.

Sensor accuracy varies across wear, and readings on the first day are the least reliable. Calibration practice and compression artefacts explain many alarming single values.

The diabetes and obesity programmes are separate, with different populations and different primary endpoints. Reading a result across from one to the other is not a comparison.

I will update this if the picture changes rather than quietly leaving it up.

1,609 up / 553 down74% upvoted38 commentsid 1sut7c26 May 2026

38 comments

27 in this archive, depth 5

best — the order this archive was captured in

u/source_or_silence137 points·2 months ago

The three numbers, and what each one can and cannot tell you.

A1c is an average over about three months, weighted to the recent weeks. It cannot show variability and it lags change. Continuous monitoring shows the shape — excursions, overnight, time in range — and is where improvement usually becomes visible first. Fingersticks are point measurements, useful for sanity-checking a sensor and for specific questions.

Most of the frustrated posts here come from expecting one of the three to answer a question that belongs to another. And all three are inputs to a conversation with whoever manages your care, which is not this board.

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u/tomas_kimani87 points·2 months ago

That is a sensor value, not a plasma value, and the two are not interchangeable at that level of precision.

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u/tomas_kimani37 points·2 months ago

What does time in range look like, not just the average?

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[removed]65 points·2 months ago

[removed by moderator]

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u/hana_lehtinen109 points·2 months ago·edited

Have you taken this to whoever manages your diabetes?

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u/joaquin_trevinoOP81 points·2 months ago

Is that a first-day sensor reading?

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u/hamza_weiss20 points·2 months ago·edited

Small fix — insulin secretion in this class is glucose-dependent, which is precisely why the risk you describe comes from the other agent.

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u/reship_roulette24 points·2 months ago

dose for glycaemic control is not the same conversation as dose for weight

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u/rui_only_ro113 points·2 months ago

Push back: one sensor reading is not a data point worth acting on, especially in the first day of wear.

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u/fasting_insulin_f70 points·2 months ago

Push back: one sensor reading is not a data point worth acting on, especially in the first day of wear.

Agreed, and the glucose-dependence point is the reason the risk profile reads the way it does.

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u/joaquin_trevinoOP50 points·2 months ago

Correcting myself: 22 weeks between those two A1c results, which is too short an interval to interpret.

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u/marisol_moreau88 points·2 months ago

Yes — time in range tells you about variability, which the average deliberately hides.

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u/joaquin_trevinoOP36 points·2 months ago

Correction: that trial is the diabetes programme and the figure you quoted is its glycaemic endpoint, not a weight result.

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u/arne_amankwah29 points·2 months ago

Careful, that is a regimen change suggestion and it needs to come from whoever manages your diabetes.

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u/teodor_duarte66 points·2 months ago

sensor accuracy varies and the first day of a sensor is the worst

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u/amylin_amyamylin52 points·2 months ago

That A1c change is inside the assay’s variability and the interval you measured over is too short.

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u/piotr_bruun36 points·2 months ago

Disagree — that is an obesity trial endpoint and this thread is about glycaemic control.

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u/gentle_correctionMOD27 points·2 months ago

Retitled — the original quoted an obesity endpoint as a glycaemic one.

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u/iman_castellanos49 points·2 months ago

Cosigning that postprandial excursions improve first and the fasting number is the laggard.

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u/zaid_dahlberg29 points·2 months ago

Agreed. A1c is an integrated average over roughly three months and treating it as a current reading causes a lot of unnecessary alarm.

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u/enzo_danquah10 points·2 months ago

Postprandial excursions flattened out first and the fasting number took months to follow. Nobody had told me to expect that order.

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u/freya_onwuka23 points·2 months ago

hypoglycaemia risk depends far more on what else you take

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u/marta_weiss9 points·2 months ago

variability matters as much as the mean

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u/plain_titration6 points·2 months ago

Fasting or postprandial?

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u/osman_ferrari-10 points·2 months ago

I would not compare your numbers to that population. Different baseline, different regimen, different trial.

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u/appeal_letter_al1 point·2 months ago

check the trial population before quoting a result at somebody

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u/sunday_shot_sal1 point·2 months ago

This. Hypoglycaemia risk in this class is driven mostly by the other agents in the regimen.

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About c/t2dglp1

Type 2 diabetes as the original indication: A1c trajectories, CGM traces, hypoglycaemia risk when stacked with sulfonylureas or insulin, metformin combinations, and why the weight-loss conversation sometimes drowns out the glycaemic one.

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