The Glucose Never Lies® Podcast

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Jess Shaw was diagnosed with type 1 diabetes on the evening of the worst trial of her life, then spent ten years pretending she did not have it.

Jess is an England netball international, living with type 1 diabetes. In this conversation with John she talks about keeping it quiet as a teenager, being sent home from a tour, a first England cap at a few days' notice, and what changed once she started talking about it. If you have ever hidden your diabetes to keep your place in a team, or you coach someone who might be, this one is for you.

Chapters
00:00 Welcome: how John and Jess met
04:33 Diagnosis at 13: the Leeds trial
08:47 The first rules, and a lot of lows
15:08 Why the first messages stick
18:03 Moving to time in range
19:09 A low HbA1c that hid the lows
20:50 Ten years of hiding it
23:57 Sent home alone at 16
25:10 Why sport needs a diabetes policy
28:43 Super League, England and injuries
34:50 First cap against Australia
38:34 Game day on injections
43:20 Insulin on board and exercise
44:36 A closed loop overnight
46:43 Building a game-day routine
47:44 Commonwealth Games
51:06 Semi-finals and staying consistent
59:23 What John heard
64:21 Jess: you are not alone
69:24 Thanks from John

Guest: Jess Shaw, England netball international, living with type 1 diabetes.
Host: John Pemberton, founder of The Glucose Never Lies, a paediatric diabetes dietitian, and a person living with type 1 diabetes.

A note on scope. Where John describes practice at Birmingham Children's Hospital, he is speaking in his clinical role there, and that sits outside GNL. It is a report of one specialist paediatric service, not GNL guidance, not a protocol, and not a recommendation to any other service or family. The support John gave Jess as an adult was through GNL's consultation service, not his NHS role, and her own diabetes team made the decisions about her treatment, including her pump. What Jess describes is her own experience. It is not a claim about what GNL, or any device, will do for anyone else, and it is not advice to anyone listening.

Links
Show notes: theglucoseneverlies.com/episode-44-jess-shaw-type-1-netball
Watch on YouTube: youtu.be/x3zsbZuffCQ
Previous episode: theglucoseneverlies.com/episode-43-tandem-control-iq-plus-mobi

Grace, our AI diabetes educational adviser, did not write a word of this. Credited anyway. Ask her anything: theglucoseneverlies.com/gnl-grace

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

Suggest guests or get in contact

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

Suggest guests or get in contact

Suggest guests or get in contact

John Pemberton was at Croke Park on 21 May for DICE — Diabetes Ireland Conference and Exhibition — Ireland's premier annual event for healthcare professionals working in diabetes. The day also saw the launch of the landmark National Policy and Services Review for diabetes in Ireland. John grabbed a microphone and seven conversations. This episode is all of them.

Anjanee Kohli is Co-Director and Creative Director of The Glucose Never Lies® and the host for this episode. John Pemberton is founder of The Glucose Never Lies® and a paediatric diabetes dietitian at Birmingham Women's and Children's NHS Foundation Trust; he is also a person living with T1D. This episode reflects the independent views of both.

This episode covers:

• Sinead Powell (Education and Support Coordinator, Diabetes Ireland): the COPE programme, emotional wellbeing in type 2 diabetes, language, stigma, and why information alone is never enough
• Kathy Breen (Clinical Specialist Dietitian and Dietetic Lead, National Diabetes Programme): what Language Matters looks like in practice, person-first language, and its inclusion in the new national strategy
• Kate Gaievska (Clinical Manager for Advocacy and Research, Diabetes Ireland): why adult diabetes psychology services in Ireland are effectively non-existent, what the strategy commits to, and the long road of implementation
• Professor Fidelma Dunne (University of Galway / National Clinical Trials Network in Diabetes): how clinical trials get funded, why real-world data matters, and why research is not the icing on the cake
• Christine Newman (Diabetes Consultant, Galway): hybrid closed-loop in pregnancy, CGM for type 2, and the case for free glucose strips for gestational diabetes
• Professor Derek O'Keefe (Consultant Physician and Professor of Medical Device Technology, UHG): Mochara, a bounded AI education tool that matched nurse and doctor performance in trials, ambient clinical documentation, intelligent dynamic triage, and what multimodal AI means for diabetes care
• Dr Tomas Griffin (Consultant Diabetologist, Galway / DTN Ireland): what the strategy means for pump access, the DTN Ireland roadshow, and why every tier of hospital in Ireland is now starting pump therapy

Show notes: https://theglucoseneverlies.com/

Have more questions? Ask GNL Grace, a diabetes educational adviser built by a team with skin in the game. Grace gets you 80% of the way there with 20% of the effort; the final 20% takes self-discovery, guided by human expertise and trial-and-error learning. https://theglucoseneverlies.com/gnl-grace/

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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Every few months, The Glucose Never Lies stops and takes stock. No single guest, no single topic: three CGM Series episodes have landed since the last round-up, Grace has a new model, and John has appeared on two podcasts that are not his own. This episode covers all of it.

Anjanee Kohli is Co-Director and Creative Director of The Glucose Never Lies® and the host for this episode. John Pemberton is founder of The Glucose Never Lies® and a paediatric diabetes dietitian at Birmingham Women's and Children's NHS Foundation Trust; he is also a person living with T1D. This episode reflects the independent views of both.

This episode covers:
- CGM Series catch-up: episodes 38, 39, and 40 in one conversation
- The IFCC glucose stress test: what it measures, the CE-versus-FDA accuracy gap, and the car crash analogy for insulin-dosing sensors
- The MDI generation gap: why people on injections have had one generation of CGM while pump users have had five
- What 17 early adopters actually reported about Night Low Predict and Glucose Predict on the Accu-Chek SmartGuide
- Grace's new model: a 30-day free trial for everyone, then Personal at £5 a month (£50 a year) and HCP at £20 a month (£200 a year); a £5 Buy Me a Coffee sponsorship opens a free account for someone on the waiting list
- The near-bankruptcy moment: flat architecture to wiki retrieval layer, cost reduced to roughly five per cent
- Why Grace has no memory by design: the deliberate reasoning behind a deliberate constraint
- John on Diabetech (Gary Shiner's show, hosted by Justin): CGM international testing standards
- John on Tomorrow's Medicine with Arseniy Arsentyev: how Grace was built, the antibody result that started it, and what nearly ended it
- AI and healthcare work: the people who adapt, the people who hide behind procedure, and what cannot be automated

Show notes: https://theglucoseneverlies.com/episode-41-cgm-series-grace-diabetech/

Before this episode, John appeared on:
Diabetech (Gary Shiner's show, hosted by Justin): https://youtu.be/6sxM1HOxcP4?si=2B3lHzyjSBgPKYfb
Tomorrow's Medicine with Arseniy Arsentyev: https://youtu.be/60MZGAk86NY?si=l3oF1J37EiI7fcCE

Have more questions? Ask GNL Grace, a diabetes educational advisor built by a team with skin in the game. Grace gets you 80% of the way there with 20% of the effort; the final 20% takes self-discovery, guided by human expertise and trial-and-error learning. https://theglucoseneverlies.com/gnl-grace/

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Disclaimer
This podcast is for education and informational purposes only. It does not constitute medical advice and is not a substitute for individualised care.

The Glucose Never Lies® is independent by design
We do not accept sponsorships and advertising. We operate via education grants and donations from listeners who value independence. So, consider:
Buying the GNL a Coffee: https://www.buymeacoffee.com/gnlfree

Enquiries
Collaboration: John Pemberton, [email protected]
Creatives: Anjanee Kohli, [email protected]

Follow The Glucose Never Lies®
Website: https://theglucoseneverlies.com/
Instagram: https://www.instagram.com/theglucoseneverlies
LinkedIn: https://www.linkedin.com/company/theglucoseneverlies
LinkedIn John Pemberton: https://www.linkedin.com/in/john-pemberton-587104361/
LinkedIn Anjanee Kohli: https://www.linkedin.com/in/anjanee-kohli-chohan-1b22a217b/
Instagram Anjanee Kohli: https://www.instagram.com/anjanee.dietitian
X: https://twitter.com/GlucoseNLies

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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People on MDI have had one generation of CGM technology: a sensor that tells you what your glucose is doing now, with a 15-minute trend arrow. While pump users have moved through five iterations, injection users have been waiting. The Accu-Chek SmartGuide is the first attempt at a second generation - and this episode asks whether it delivers.

Amy Jolley is a Highly Specialised Dietitian, Lead Educator at the Diabetes Technology Network UK, and Lead for the Young Adult and Transition Service at Salford NHS Foundation Trust. This episode is not endorsed by Roche Diagnostics, but the experience of a healthcare professional's experience of putting 17 people onto the SmartGuide in one week, running group onboarding sessions, and asking them to come back and tell her what actually happened. Her host, John Pemberton, is founder of The Glucose Never Lies® and a person living with T1D. 

This episode covers:
- Why MDI has been stuck at Generation 1 while pump technology moved through five iterations
- Night Low Predict: RAG ratings, first-half versus second-half of the night, and how to teach it
- Glucose Predict: the 45-minute action window versus the two-hour awareness window
- What 17 early adopters actually reported back
- How the 45-minute look ahead reduces the rage bolus
- Why calibration is an educational opportunity, not a drawback
- CGM market saturation and the DTN quality standard
- The DTN Competency Assessment Framework: four tiers, self-assessment, a training passport for clinicians
- GNL Grace in clinical practice: Amy's feedback from a specialist service supporting 700 AID users

Show notes: https://theglucoseneverlies.com/accu-chek-smartguide-mdi-cgm-series/

Have more questions? Ask GNL Grace, a diabetes educational advisor built by a team with skin in the game. Grace gets you 80% of the way there with 20% of the effort; the final 20% takes self-discovery, guided by human expertise and trial-and-error learning. https://theglucoseneverlies.com/gnl-grace/

---

Disclaimer
This podcast is for education and informational purposes only. It does not constitute medical advice and is not a substitute for individualised care.

The Glucose Never Lies® is independent by design
We do not accept sponsorships and advertising. We operate via education grants and donations from listeners who value independence. So, consider:
Buying the GNL a Coffee: https://www.buymeacoffee.com/gnlfree

Enquiries
Collaboration: John Pemberton, [email protected]
Creatives: Anjanee Kohli, [email protected]

Follow The Glucose Never Lies®
Website: https://theglucoseneverlies.com/
Instagram: https://www.instagram.com/theglucoseneverlies
LinkedIn: https://www.linkedin.com/company/theglucoseneverlies
LinkedIn John Pemberton: https://www.linkedin.com/in/john-pemberton-587104361/
LinkedIn Anjanee Kohli: https://www.linkedin.com/in/anjanee-kohli-chohan-1b22a217b/
Instagram Anjanee Kohli: https://www.instagram.com/anjanee.dietitian
X: https://twitter.com/GlucoseNLies

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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Michael Skarlatos from Abbott UK Medical Affairs joins John Pemberton for the second manufacturer episode of the CGM Series. A former diabetes specialist dietitian at University Hospitals of Leicester, Michael brings real clinical experience to an honest breakdown of the FreeStyle Libre 2 Plus and 3 Plus.

This episode covers:
- Why Abbott accuracy data qualifies these sensors for insulin dosing: ICGM approved, 20/20 performance ~95-96%, outside-40/40 error rate 0.2%
- What 70% smaller means in practice: form factor, stigma, and the all-in-one applicator on Libre 3 Plus
- Pump integrations now and the roadmap: CamAPS FX, Omnipod 5, and what is coming
- Libreview: why Abbott moved off Glooko and what population health management enables
- Libreview Pro in SystmOne and EMIS with SNOMED-coded CGM metrics
- A critical data nuance: glucose measured every minute on the patient app but recorded every 5 minutes in clinical downloads
- Continuous ketone monitoring: what Abbott has in development and who benefits most

CHAPTERS
00:00 Introduction and CGM Series overview
00:57 Michaels background and Leicester NHS Trust
02:25 Moving from NHS to Abbott Medical Affairs
03:27 Accuracy credentials: ICGM approval and 20/20 performance
05:44 FreeStyle Libre 3 Plus: size and form factor
09:25 Pump integrations: CamAPS FX, Omnipod 5, and the roadmap
10:19 ICGM interoperability: US vs CE marking in Europe
12:05 Fifteen-day wear period
12:28 Abbott market history: free samples and patient-led adoption
14:04 Simplicity of onboarding and multi-language support
16:58 Starter clinics: taking onboarding off the HCP
19:33 Libreview and population health management
23:21 EHR integration, SNOMED codes, and QOF implications
25:46 Practical tips: Bluetooth connectivity and the app cache
29:23 Minute-by-minute data vs five-minute trend recording
30:58 Low glucose event thresholds and hypo underreporting
31:42 Continuous ketone monitoring: what is coming from Abbott
37:52 CGM beyond type 1 and patient advocacy
40:17 Closing thoughts

LINKS
Show notes: https://theglucoseneverlies.com/episode-38-freestyle-libre-abbott/
YouTube: https://youtu.be/IW1sa5APHU8
CGM Series: https://theglucoseneverlies.com/10-13-cgm-series/
GNL Explorers: https://theglucoseneverlies.com/gnl-grace/

Buzzsprout: https://www.buzzsprout.com/2451357/18982022
Apple Podcasts: https://podcasts.apple.com/gb/podcast/the-glucose-never-lies/id1795741144
Spotify: https://open.spotify.com/show/2MlGlz2G8LsbDnuGtAh77W

This content is for educational exploration only. Not medical advice.

Support GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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Three months ago, GNL was a website full of excellent content that was genuinely hard to find. In Episode 38, John Pemberton and Creative Director Anjanee Kohli talk through what happened next: a complete website rebuild, five interactive explorers, the launch of GNL Grace, and the evidence base behind it, drawn from approximately 500,000 patient-days across roughly 1,300 people living with diabetes over more than 10 years.

In this episode:

• CGM guide update and the five-out-of-five accuracy chart
• How the five GNL Explorers work and how clinicians are using them in practice
• GNL Grace: a bounded AI educational advisor built on 2,000 curated citations
• Grace: a 30-day free trial for everyone, then Personal at £5 a month and HCP at £20 a month
• Real-world validation: approximately 500,000 patient-days across roughly 1,300 people living with diabetes over more than 10 years
• Why the skill of the future in healthcare is compassion, not knowledge
• Phil Hayes joining as Technical Director
• GNL merch and the Diabetes UK giveaway

Chapters:

• 00:00 Introduction
• 01:55 GNL Grace announcement
• 02:32 CGM guide and accuracy chart
• 05:30 Phil Hayes and the explorer infrastructure
• 09:40 GNL Grace: the six-layer bounded AI
• 10:50 Grace tiers explained
• 13:31 Grace Max: manuscript-grade output
• 17:31 Real-world validation: the evidence base behind Grace
• 19:58 The skill of the future is compassion
• 30:09 What went wrong and lessons learned
• 35:06 GNL merch
• 36:10 Closing

Links:

• Show notes: theglucoseneverlies.com/episode-38-quarterly-review
• GNL Grace: theglucoseneverlies.com/gnl-grace
• GNL Explorers: theglucoseneverlies.com/gnl-explorers
• CGM Series hub: theglucoseneverlies.com/10-13-cgm-series

Host: John Pemberton. Director of Creativity: Anjanee Kohli.

This content is for educational exploration only. It is not medical advice and cannot replace individual clinical guidance from your diabetes care team.

Support GNL: https://www.buymeacoffee.com/gnlfree

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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Most people with T1D have switched their CGM high alert off. Not because they do not care - because it goes off every time they eat and there is nothing they can do about it. Episode 37 is about what Dexcom built to fix that.

Adam Dawes, Senior Medical Affairs Manager at Dexcom UK and Ireland - and a former paediatric diabetes nurse specialist - joins John Pemberton for the third manufacturer episode of the CGM Series. An honest clinical conversation about the Dexcom G7 and ONE+, what separates them, and where Dexcom is heading next.

This episode covers:
- Dexcom G7 vs Dexcom ONE+: same hardware platform, different software, and what that means for matching the right sensor to the right patient
- Delay 1st Alert: why it is one of the most underused alerts in CGM, how it eliminates alarm fatigue without reducing safety, and how John uses it himself
- AID integrations: Tandem T:slim X2, Omnipod 5, mylife, and the Tandem Mobi
- CGM for type 2 diabetes: the biofeedback argument and why immediate glucose feedback changes behaviour in ways a quarterly HbA1c never can
- The Dexcom roadmap from ATTD 2026: 15-day sensor, Dexcom G8 next generation sensor, EPIC integration, Clarity updates, and generative AI
- Why insulin dosing will never be a commodity market - and what people with T1D need to understand as new CGMs enter the UK
- The FDA manufacturing findings: what happened, how Dexcom responded, and why the new Ireland factory matters

Show notes: https://theglucoseneverlies.com/episode-37-dexcom-g7-one-plus/ | CGM Series: https://theglucoseneverlies.com/10-13-cgm-series/

Have more questions about CGM, the Dexcom G7 or ONE+? Ask GNL Grace: https://theglucoseneverlies.com/gnl-grace/

Support GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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CGM Series | The Glucose Never Lies® Podcast

Three of the UK's leading diabetes specialist nurses on why CE marking is not a quality standard for CGM accuracy, why data sufficiency must come before device comparison, and what ATTD 2025 revealed about where diabetes technology is heading. A frank, clinical conversation grounded in years of front-line practice — and the story of how the DSN Forum's five-point accuracy scoring system was built.

In this episode:

• Why the DSN Forum created its CGM comparison chart and how it has evolved
• Why CE marking is not a quality standard for CGM accuracy
• How the five-point accuracy scoring system works and what it requires from a device
• Why only four devices currently meet the data sufficiency standard
• What 20/20 and 40/40 agreement rates mean in real clinical terms
• Why everyone using CGM for insulin decisions still needs a working finger-prick meter
• The calibration debate: does the option to calibrate add safety or risk?
• What ATTD 2025 revealed about fully closed loop systems — and who may not benefit
• The case for GLP-1 in type 1 diabetes and why priority access matters
• Abbott's continuous ketone monitor: opportunity, unknowns, and risks
• AID system optimisation, insulin on board, and the GNL AID System Explorer

Chapters:

• 00:00 — Introduction: meeting Amanda, Beth and Tamsin
• 02:14 — Why the DSN Forum CGM comparison chart was created
• 06:47 — Turning complex CGM evidence into a practical scoring system
• 16:23 — How CGM choice works in real clinical settings
• 20:36 — Why finger-prick testing still matters — and the calibration debate
• 29:26 — What stood out at ATTD 2025
• 44:03 — AID systems, insulin on board, and the GNL AID optimiser
• 49:49 — Where to find the DSN Forum, the chart, and closing thoughts

Guests: Amanda Williams (Lead Diabetes Nurse, East Kent), Beth Kelly (Clinical Lead DSN, Wiltshire), Tamsin Fletcher-Salt (Lead DSN, University Hospital North Midlands). All core members of the Diabetes Specialist Nurse Forum UK.

Links:

• Full show notes: https://theglucoseneverlies.com/episode-36-cgm-accuracy-dsn-forum/
• DSN Forum CGM Comparison Chart: https://www.diabetesspecialistnurseforumuk.co.uk/new-cgm-comparison-chart
• CGM Guide Part 2 — Assessing CGM Accuracy: https://theglucoseneverlies.com/assessing-cgm-accuracy-performance/
• GNL AID System Explorer: https://theglucoseneverlies.com/aid-system-explorer/
• Episode 35 — Professor Othmar Moser on CGM Study Design: https://theglucoseneverlies.com/episode-35-cgm-series-the-importance-of-cgm-accuracy-and-study-design-with-professor-othmar-moser/

Educational purposes only. Not medical advice. Always work with your diabetes care team.

Support GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.

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CGM Series | The Glucose Never Lies® Podcast

CGM accuracy is usually described with a single number: MARD. But a low MARD can hide significant risk if the study behind it was poorly designed. Professor Othmar Moser — one of the leading independent CGM accuracy researchers — explains what study design actually determines, why meal and insulin challenges are non-negotiable, and what people with type 1 diabetes and clinicians should look for when evaluating any accuracy claim.

In this episode:

• What MARD is and why it misleads when used in isolation
• The five study design questions that determine what accuracy data actually means
• Why 20/20 and 40/40 agreement rates reveal what MARD cannot
• Why meal and insulin challenges are essential for real-world accuracy testing
• What CE marking does and does not guarantee about CGM performance
• Why peer-reviewed, independent evidence is the gold standard — and how little of what is cited meets it
• How study design quality shapes what we actually know about CGM risk
• Professor Moser's perspective as a researcher who designs and runs these studies

Guest: Professor Othmar Moser, Medical University of Graz, Austria. Leading figure in independent CGM accuracy study design and insulin-related exercise physiology research in type 1 diabetes.

Links:

• Full show notes: https://theglucoseneverlies.com/episode-35-cgm-series-the-importance-of-cgm-accuracy-and-study-design-with-professor-othmar-moser/
• CGM Guide Part 2 — Assessing CGM Accuracy: https://theglucoseneverlies.com/assessing-cgm-accuracy-performance/
• CGM Guide Part 1 — How to Choose a CGM: https://theglucoseneverlies.com/select-continuous-glucose-monitor-cgm-understanding/
• Episode 36 — DSN Forum: CGM Accuracy and ATTD 2025: https://theglucoseneverlies.com/episode-36-cgm-accuracy-dsn-forum/
• Watch on YouTube: https://youtu.be/zTdTps42kQ8

Educational purposes only. Not medical advice. Always work with your diabetes care team.

Support GNL: https://buy.stripe.com/9B63cx4UO3KEdKC0Sp7Re00

The Glucose Never Lies® is a registered trademark of The GNL Ltd. Company No. 16733595. UK VAT No. GB 516 3272 08.

Independent by design. The Glucose Never Lies® takes no sponsorship and no advertising. We run on education grants and listener donations. If this helped, buy the GNL a coffee (buymeacoffee.com/gnlfree).

Follow: Website, Instagram, LinkedIn, John on LinkedIn, X

Contact: collaboration, [email protected]; creatives, [email protected]

For education only. Not medical advice and not a substitute for individual care; decisions about your care sit with you and your diabetes team.

© The Glucose Never Lies Ltd, company number 16733595. All rights reserved.