The GNL Podcast

Episode 29, The Behaviour Change Playbook for Type 1 Diabetes

You start the week with the plan and the motivation. Then reality happens: hunger, fatigue, an alarm that fires at the worst moment, a glucose reading that looks like failure even though you did everything right. By Thursday the plan is quietly abandoned, and the story you tell yourself is that you simply lack the willpower. This episode argues that willpower was never the part you were missing.

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Want to turn a CGM reading from a moral grade into a piece of information you can learn from, the reframe at the heart of this episode?

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Episode 29 cover image, behaviour change playbook for type 1 diabetes

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Also available on YouTube. Guest: Vanessa Haydock (The Diabetic Health Coach). Host: John Pemberton.

Why this episode exists

If you live with type 1 diabetes, you already do something most people never have to: you make a constant stream of decisions about food, insulin, activity, and risk, on top of an ordinary life. You have probably also noticed that the condition often punishes good behaviour just enough to make you want to stop trying. That is not a character flaw. It is what happens when a relentless cognitive load meets a finite supply of willpower.

This episode swaps the willpower story for a behaviour-change approach that works with human psychology and diabetes physiology rather than demanding heroic effort. Vanessa Haydock brings a psychology and applied behaviour analysis background to a simple claim: change is more likely to stick when you redesign the conditions around it, not when you try harder inside the same conditions.

In this episode

Many people start a new phase with motivation, then reality happens: hunger, fatigue, alarms, hypoglycaemia, stress, and the frustrating truth that type 1 diabetes often punishes good behaviour enough to make you want to stop trying. In this episode, John and Vanessa unpack a behaviour-change approach that works with human psychology and diabetes physiology rather than demanding heroic willpower.

The conversation is organised around five principles. Taken together they form a single argument: design the system, prompt the behaviour, lower the threat, match the support to the person, and build community that is safe rather than shaming.

The five principles at a glance

Principle 1, Design beats discipline: build systems that reduce the daily decision load.
Principle 2, Cues beat grit: prompts in the environment outperform trying to remember.
Principle 3, Reduce threat before effort: if it feels too hard or too scary, avoidance tends to win.
Principle 4, Hawk or Owl, Carrot or Stick: pick accountability and feedback that actually fits your nervous system.
Principle 5, Community support, not shame: small, safe networks tend to beat noisy online environments where comparison dominates.

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Key themes

Design beats discipline

Willpower is finite for everyone, and type 1 diabetes burns through it faster because the cognitive load is relentless. The fix tends not to be “try harder”, it is reducing the number of fresh decisions you need to make each day.

Turn repeated choices into default rules, simple heuristics you already trust
Make goals concrete and realistic, SMART goals are useful here if they reduce pressure rather than create it
Think in next-step goals (e.g., 30% to 40% time in range) rather than leaps that trigger avoidance

Cues beat grit

Humans tend to take the path of least resistance. If the environment does not prompt the behaviour, you are relying on memory under fatigue, which is a practical joke on yourself.

Place the thing you forget next to the thing you always do
Piggyback new behaviours onto existing routines (shower, kettle, brushing teeth)
Kids often need visual, engaging cues; adults often need friction removed and prompts made obvious

Reduce threat before effort

If the goal feels too big, too shaming, or too emotionally loaded, avoidance behaviours tend to rise, especially in diabetes, where you can do everything right and still get a glucose reading that looks like failure.

Lower the demand level until you can engage without dread, small wins first, then scale
Reframe CGM from judgement to data: this is not a moral grade, it is information
Use learning language: “What happened? What is the likely driver? What is one tweak for next time?”

Hawk or Owl, Carrot or Stick: pick what fits you

Accountability is not one-size-fits-all. Some people thrive with frequent check-ins. Others do better with spaced reflection. Same with feedback: some want direct truth, others need encouragement first or they shut down.

Choose the support style that fits you, not the one you think you should need
Make it explicit: how often do you want check-ins, and what style of feedback helps rather than harms?

Community support, not shame

Diabetes is isolating, and isolation tends to increase burnout and avoidance. But community can heal or harm depending on whether it is psychologically safe and reality-based.

Small, trusted groups tend to outperform large spaces where nobody has real accountability
Share the difficult days as well as the good ones, it normalises reality and reduces shame
The goal is support and learning, not comparison and perfection

Design the conditions, do not blame the willpower. The trade-off the episode keeps naming is between the effort of trying harder inside the same setup and the smaller, smarter effort of changing the setup itself. Willpower is finite, and type 1 diabetes spends it faster than most lives do; the principles all point the same way, towards reducing the demand before adding the effort.

Practical exploration

The episode closes with a five-step framework you can walk through for one behaviour you would like to change. It is framed as exploration, not instruction; the answers are yours to find.

A five-step exploration framework

Step 1 (Design): What is one behaviour you want to change?

Step 2 (Reduce threat): What is the smallest version of that change you could try for seven days without dread?

Step 3 (Cues): What existing routine will you piggyback onto, and what physical cue will you place where you cannot miss it?

Step 4 (Accountability): Do you need a hawk or an owl, and do you respond best to carrot or stick?

Step 5 (Community): Who is one person or small group you can be honest with this week without shame?

About the guest

Vanessa Haydock is The Diabetic Health Coach, a psychology and applied behaviour analysis background, certified behaviour analyst, personal trainer, and coach supporting people with type 1 diabetes with sustainable behaviour change.