GNL Guides
Build solid foundations,
follow your curiosity,
and learn about tech.
Twelve foundations, six core guides, four key guides, four technology guides (two of which branch into device-specific deep-dives: CGM sensors and AID systems), and two guides for life stages. Score 9 out of 10 and you earn a certificate you can keep. The set grows as new evidence and new devices are published.
See the Learn T1D Map
Five sections, 17 entry tiles, 65 live guide pages beneath them, 36 quizzes that end in a certificate. Read from the live site on 26 July 2026.
1. Start here, the foundations
You need a score of 9 out of 10 on all twelve module assessments before tackling the more advanced guides. Every other guide assumes you have solid foundations in place.
Foundations
Everything else on this page assumes these are already in place. Twelve short parts in order, from what type 1 diabetes is, through the highs, the lows and carb counting, to ketones and measuring whether things are going well.
Read the guide →Foundations first, always. The guides below offer extra insight to those who have solid foundations.
2. Core management
The day-to-day. Mealtimes, insulin on board, dynamic glucose management, more on hypos, and activity and exercise.
Mealtime Insulin
A high-carb plate, a balanced plate, and a pizza each ask something different of the same dose. Three parts on getting the timing and the shape of the dose to match the meal.
Read the guide →Insulin on Board
What is still working from the last dose, and why your device’s answer may not match your body’s. Four parts on the models behind the number, the device settings, and the trade-off in a shorter or longer active insulin time.
Read the guide →Dynamic Glucose Management
Some glucose moves fast and some moves slow, and the two need different responses. The GAME, SET and MATCH framework, how it compares with an AID system, and what to look for in your own CGM data.
Read the guide →Exercise
Fast physiology meeting slow insulin. Where the risk actually sits before, during, and after a session, on injections and on an AID system, with an explorer for planning your own.
Read the guide →Activity Snacking
Ten minutes of movement after a meal is a lever most people already have and rarely pull. A short read on what post-meal movement does to the curve.
Read the guide →Hypoglycaemia, Advanced
Warning signs can fade quietly, and the overnight report is often the only place the pattern shows. On how awareness is measured, what a relative hypo is, and how the picture differs for children.
Read the guide →3. Key guides
The depth guides worth knowing exist once the day-to-day is settled: measurement, a night out, and insulin resistance.
HbA1c and Time in Range
Two people with the same HbA1c can be running very different glucose. Five parts on your CGM zone, your glycator status, and finding a time-in-range target that fits you rather than the default.
Read the guide →Partying with Type 1
Alcohol, stimulants, and psychoactives share two problems in type 1: the dose is uncertain and self-rescue is harder. Written for adults, for the night as it actually goes.
Read the guide →Insulin Resistance
Type 1 is uniquely exposed to insulin resistance. Part 1 maps the causes, what insulin-sensitive looks like in numbers, and why fat loss can feel like a trap.
Read the guide →4. Technology, medicines and the evidence
The kit, the medicines, and how to weigh the research for yourself. We only cover what we would use ourselves and give the people we love, and we show our working.
Devices and medicines
CGM
Five questions decide whether a sensor has been tested properly. Then a deep dive into the ones that clear all five: Dexcom, Libre, Roche SmartGuide and MiniMed.
Read the guide →AID
Every system that clears the evidence bar, and what each algorithm asks of you. No system wins on time in range, so the selector matches your top two.
Read the guide →GLP-1 Q&A
Evidence-graded answers on GLP-1 and GIP therapy in type 1: what the trials show, how insulin reduction is approached, and the safety questions worth taking to your team.
Read the guide →Skincare
Sensors and infusion sets ask a lot of the same skin. What tends to go wrong, and the five habits that keep sites usable, from where they go on to how the tape comes off.
Read the guide →Reading the evidence
How to Read a Research Study
A headline rarely survives contact with the study behind it. Seven parts on reading a paper for yourself, so you can see what a result does and does not support.
Read the guide →5. Children and young people with type 1 diabetes
Type 1 changes as a child grows. Guides for the years where the ground shifts fastest.
Infants and Preschoolers (Under 6)
The dose is small, the child cannot tell you they feel low, and the work is largely yours. On the patterns that show up before school age, and what carers say they need at home.
Read the guide →Adolescents (15 to 17)
The dip through these years is structural, not a personal failure. On distress, disordered eating, technology refusal, and the parent role shifting from manager to coach.
Read the guide →