Breaking sugar addiction and building lasting health habits

Executive overview

Most health advice repeats what people already know. The more useful question is which underused, science-backed strategies actually change behaviour. Dr Amantha Imber, organisational psychologist, shares how she overcame chronic insomnia, a severe sugar addiction, and inconsistent exercise through specific, evidence-based tactics.

The gap between knowing and doing is where most health efforts fail — closing it requires changing your environment and your identity, not just your information.

Sleep: the case for restriction

• Chronic insomnia with no physiological cause points to a psychological association problem — the bed becomes linked to anxiety, not sleep.
• Sleep restriction works by compressing time in bed to match estimated actual sleep time, building hormonal sleep pressure until falling asleep quickly becomes the norm.
• Example: spending 10 hours in bed but sleeping ~6 hours → restrict to 6 hours in bed, staying up until 1am until the association resets.
• Once reliably sleeping through the restricted window, gradually extend bedtime toward the target (e.g. 8 hours).
• This is the most powerful evidence-based insomnia treatment, yet widely underused.
• Morning light exposure within the first 1–2 hours of waking resets the body clock, clears sleep inertia, and anchors consistent sleep timing.

Quitting sugar: environment and identity

• Information alone doesn't change behaviour — reading books about quitting sugar and trying willpower both failed.
• Environmental hijackers: sugary food in the house makes resisting it the harder default. Remove it to make the healthy choice automatic.
• The most powerful tool was switching self-talk from "I can't eat sugar" to "I don't eat sugar".
• Research by Vanessa Patrick found that "don't" language made participants 50% more likely to choose the healthy option over "can't" language.
• "Can't" signals a rule imposed from outside; "don't" signals identity — it defines who you are, not what you're forbidden to do.
• Maintaining identity-based language for a decade has produced ~95% adherence without white-knuckling.
• Stress can erode the identity over time; re-removing trigger foods from the environment resets it.

Blood glucose: why food order matters

• Stable blood glucose prevents post-meal energy crashes, reduces hunger, and improves concentration.
• The sequence of eating within a meal significantly affects the glucose response.
• Eating vegetables first, then proteins and fats, then carbohydrates produces a much smaller spike and crash than eating carbs first or all at once.
• This replicated finding applies to mixed meals (poke bowls, protein + veg + rice) though not to single-dish meals like pasta.
• A 10-minute leisurely walk ~30 minutes after eating significantly blunts the post-meal glucose spike regardless of what was eaten.
• A walk is more effective after eating than before — sit, rest, then walk.

Using a CGM to personalise nutrition

• Continuous glucose monitors (CGMs) track blood sugar in real time via a small arm patch, syncing to a phone app for 14 days.
• Blood glucose responses are highly individual — what spikes one person may not spike another.
• Running food experiments with a CGM surfaces surprising results: rice noodles and porridge (seemingly low-GI) produced large spikes for these users.
• Identifying personal spike triggers and adjusting meals improved afternoon energy and reduced reliance on coffee to compensate for crashes.
• A two-week CGM trial is enough to identify personal patterns and make lasting dietary changes.

Movement: strength, efficiency, and daily activity

• Four resistance training sessions per week provide significant benefits; pairing them with a favourite podcast (temptation bundling) makes them sustainable.
• Re-Hit (Reduced Exertion High-Intensity Interval Training) is the most time-efficient way to improve cardiovascular fitness — covered in detail in the micro workout chapter of The Health Habit.
• The 10,000 steps target has no scientific basis; research shows benefits plateau at around 7,500 steps per day.
• Vilpa (Vigorous Intermittent Lifestyle Physical Activity) — brief one-minute bursts of vigorous movement in daily life (running for a train, chasing kids) — delivers meaningful cardiovascular benefits.
• Exercise framing matters: shifting from appearance-based motivation to feeling strong and healthy sustains long-term consistency.