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c/t2dglp1·posted 13 days ago by u/joaquin_trevino

[Discussion] the weight conversation drowns out the glycaemic one

Discussion Receipts ×8

the weight conversation drowns out the glycaemic one — a position I have arrived at slowly and would like tested.

The order things move in, since nobody explains it and it worries people.

Postprandial excursions generally respond earliest. Variability tends to narrow before the average does, which is visible on a sensor and invisible on a lab result. Fasting glucose is often the laggard, and A1c — being a three-month average — is the last thing to reflect anything.

So a month in which the sensor looks better and the fasting number has not moved is the ordinary sequence, not a contradiction. Knowing that in advance would have saved me a quarter of unnecessary worry, which is why it is worth writing down.

Continuous monitoring shows the shape: postprandial excursions, overnight behaviour and time in range. Two people with identical A1c can have very different distributions.

A1c reflects average glycaemia over roughly the preceding three months, weighted towards the most recent weeks. It cannot show variability and it lags any change you make.

Screenshot none of this. Read the whole thread, including the parts where I am told I am wrong.

449 up / 36 down93% upvoted29 commentsid 1rwn9l17 Jul 2026

29 comments

20 in this archive, depth 5

best — the order this archive was captured in

u/stubborn_batchlist_maybe68 points·12 days ago

On hypoglycaemia, because the risk gets attributed to the wrong thing constantly.

Incretin-based agents stimulate insulin secretion in a glucose-dependent way: the effect scales with glycaemia rather than acting unconditionally. That is why monotherapy risk is low. Where risk rises substantially is in combination with agents that lower glucose independently of the current level.

Which means the question "does this cause hypos" is not answerable without knowing the rest of the regimen — and that the person who can answer it is the one who wrote the regimen. Nothing on this board is a substitute for that conversation, and the good threads here end by saying so.

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u/cormac_danquah51 points·12 days ago

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.

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u/stablecoin_steve18 points·12 days ago·edited

The diabetes and obesity programmes are separate, with different populations and different primary endpoints.

Adding the obvious one — bring the export, not the single number, to whoever manages this.

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[deleted]7 points·12 days ago

[deleted]

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u/camila_sandvik31 points·12 days ago

The diabetes and obesity programmes are separate, with different populations and different primary endpoints.

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

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u/yannick_barros67 points·11 days ago

Panicked over a first-day sensor reading and rebuilt my week around it. It was the sensor.

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u/teodor_duarte50 points·11 days ago

Kept fingersticks alongside the sensor for two weeks to sanity-check it. Worth doing once.

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u/neha_falk0 points·11 days ago

Kept fingersticks alongside the sensor for two weeks to sanity-check it.

Disagreeing with this line: that endpoint is from the obesity programme and does not answer the question.

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u/ice_pack_auditcold chain40 points·11 days ago

Certain conditions affect A1c independently of glycaemia. If a result looks inconsistent with the sensor data, that is a question for whoever manages your care rather than for this board.

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u/meal_prep_mira-37 points·11 days ago

Variability dropped before the average did, which was visible on the sensor and invisible on the lab result.

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u/cormac_danquah-43 points·11 days ago

My ferritin moved and it turned out to have nothing to do with glucose at all.

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u/ferran_batista1 point·11 days ago

Variability dropped before the average did, which was visible on the sensor and invisible on the lab result.

meal_prep_mira is right that the fasting number moves last. Knowing that in advance saves months of worry.

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u/iman_castellanos1 point·10 days ago

Brought the whole CGM export to my appointment rather than one number. Entirely different conversation.

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u/kian_solberg1 point·10 days ago

glycaemic control and weight are two different endpoints

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u/a1c_arcT2D1 point·11 days ago

Fasting or postprandial?

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u/cloudy_vial_carol26 points·12 days ago

Not convinced. Hypoglycaemia risk from this class alone is low; the risk you are describing comes from the combination.

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u/swirl_dont_shakereconstitution11 points·12 days ago

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

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u/joaquin_trevinoOP8 points·12 days ago

metformin and an incretin agonist are not in competition

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u/camila_vasquez5 points·11 days ago·edited

hypoglycaemia risk depends far more on what else you take

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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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