What is Via Negativa Research Bytes

The diabetes research literature is vast, noisy, and rarely written for the people who live with the condition or the clinicians who guide them. Via Negativa Research Bytes is the GNL answer to that. We read everything that lands in the GNL Scholar harvest each week, drop the off-topic noise, and surface only the small handful that change the conversation.

The page you are reading is the rolling weekly digest. It is overwritten every Wednesday with the new picks, so the URL stays stable and the latest is always the live page. Older weeks are archived locally in the GNL evidence base, where the GNL Grace engine can draw on them later.

Each pill below covers one topic area. Inside each pill we list the one or two papers picked for the week, with a plain summary and a short GNL takeaway. We do not give clinical advice. We point you at the evidence and at the relevant GNL guide or explorer where you can dig in.

Exercise and Activity

Effect of breaking up sitting with regular active breaks on glucose management and vascular function in adults with type 1 diabetes who use hybrid closed-loop insulin delivery systems

Jenkins JG, Cocks M, Lucas SJE, Rendeiro C · BMJ Open Sport and Exercise Medicine · 2026

GNL takeaway. GNL angle: Exercise Planner currently treats sedentary glycaemic risk uniformly; this study tests whether HCL algorithms already neutralise that risk, which would update the planner branching and the AID Optimiser sedentary-day guidance.

Abstract. Prolonged exposure to hyperglycaemia and glycaemic variability is associated with an increased risk of cardiovascular disease in people with T1D. Recent evidence suggests that prolonged periods of sedentary behaviour adversely affect glycaemia. The acute glycaemic effects of breaking up sitting with low-intensity walking on people with T1D using hybrid closed-loop (HCL) insulin systems are yet to be examined. The primary aim is to investigate the influence of breaking up sitting with regular active breaks on glucose management and vascular function in adults with T1D who use HCL systems.

DOI: 10.1136/bmjsem-2025-003240 · GNL relevance 5/5

AID and Automated Insulin Delivery

Quantifying the Effect of Fat and Protein on the Postprandial Glucose Excursion in Individuals With Type 1 Diabetes Using an Automated Insulin Delivery System

Faggionato E, Schiavon M, Ekhlaspour L, Kingman RS et al. · Journal of Diabetes Science and Technology · 2026

GNL takeaway. GNL angle: feeds the meal-composition section of the AID Optimiser and the post-meal arm of the Hypo Catalog (late rebound risk); also gives Grace a defensible numeric anchor when users ask ‘do I need to bolus for fat and protein on a 780G?’

Abstract. Quantifying the effect of meal composition on postprandial glucose excursions would allow optimising insulin therapy, accounting for fat and protein that can affect gastric retention, glucose rate of appearance, and insulin action. Faggionato et al. quantify fat and protein PPG impact under AID specifically (Forlenza group).

DOI: 10.1177/19322968261440943 · GNL relevance 5/5

The results of ProHCL: Patient-reported outcomes in people living with type 1 diabetes on hybrid closed-loop insulin pump therapy, experiences from the NHS England HCL pilot

Wilmot EG, Griffin T, Hagan J, Chauhan R, Crabtree T et al. · Mixed-methods study, NHS England HCL pilot (preprint or repository) · 2026

GNL takeaway. GNL angle: anchors the UK section of the AID Optimiser pack (NHS England rollout) and gives Grace a UK-pilot-specific reference when HCP users ask ‘what are real PRO gains under our pilot?’, which the manufacturer trial data cannot answer.

Abstract. This study evaluated the impact of at least 3 months of HCL use on patient-reported outcomes in PwT1D and their partners. Participants enrolled on the NHS England HCL pilot took part in a mixed-methods study, capturing PROs around quality of life, fear of hypoglycaemia, burden of self-management, and partner experience.

Safety and Effectiveness of MiniMed 780G Advanced Hybrid Closed-Loop Use with Ultrarapid Insulin Lispro-AABC in Pediatric and Adult Type 1 Diabetes

Akturk HK, Nally LM, Lal RA, Warren ML et al. · Diabetes Technology and Therapeutics · 2026

GNL takeaway. GNL angle: AID Optimiser ladder; reviewed-by-MiniMed positioning. Confirms or refutes the off-label URLi-in-780G pattern. Age-banded readout feeds the paediatric vs adult routing rules. Cite as Grade D educational synthesis on Grade B evidence base; never as endorsement.

Abstract. Given the faster onset and shorter duration of action of ultrarapid insulin lispro-aabc (URLi, Lyumjev) compared with insulin lispro, this study investigated safety and glycaemic outcomes of URLi in the MiniMed 780G advanced hybrid closed-loop system across paediatric and adult T1D cohorts.

DOI: 10.1177/15209156261444994 · GNL relevance 4/5

Technology and Devices

Evaluation of large language models for carbohydrate counting in type 1 diabetes mellitus: a comparative study with patient estimations

Raavi V · Diabetes Research and Clinical Practice (Elsevier, PII S0168822726001993) · 2026

GNL takeaway. GNL angle: load-bearing for Grace own positioning. If the paper shows LLMs match or beat PWD estimates, Grace carb-count mode has external validation; if LLMs underperform, we need the ‘population-average estimate’ qualifier on every Grace carb output. Note: harvester snippet was misaligned with title (cord-blood text leaked from another record), worth verifying the abstract directly.

Abstract. Aims: To evaluate large language models accuracy in carbohydrate counting and compare their performance with estimations by patients with type 1 diabetes mellitus. Methods: Cross-sectional study including adults with T1D, comparing LLM-estimated carbohydrate content of meal photos and descriptions against patient-reported counts.

Where this fits in the GNL system

Via Negativa Research Bytes is one input into the GNL evidence engine. The full evidence base lives in the GNL Grace knowledge graph, and you can question Grace directly via the app. The GNL explorers translate the evidence into interactive tools for AID, CGM, hypo and hyperglycaemia, exercise, and alcohol.

Open Grace · Browse the explorers · Listen to the podcast

Educational only, not medical advice. Always discuss changes in your diabetes management with your care team.