Craving Drives the Loop

The Science Behind Craving Drives the Loop

At the heart of Charles Duhigg's landmark 2012 book 'The Power of Habit' is a deceptively simple framework called the habit loop: a cue triggers a routine, which delivers a reward. But Duhigg's most important insight wasn't the loop itself, it was what powers the loop. Habits don't persist because of discipline or intention. They persist because the brain develops a craving for the reward. That craving is the neurological engine. Without it, the loop stalls and eventually breaks apart entirely.

Duhigg draws heavily on the work of MIT neuroscientist Ann Graybiel and her colleagues, who spent years mapping the basal ganglia, the ancient, deeply buried brain region responsible for habit formation. Their research revealed something remarkable: as a behaviour becomes habitual, the brain essentially 'chunks' the routine and hands it off to the basal ganglia for automatic processing. But crucially, anticipatory neural activity, the craving, begins firing not at the moment of reward, but at the moment of the cue. The brain learns to expect and hunger for the reward before it even arrives. This anticipatory craving is what makes habits so durable, and its absence is what makes lapsed behaviour so hard to restart.

This has profound implications for why patients ghost your practice. After a course of treatment, if a patient doesn't return regularly enough for the brain to form a strong cue-routine-reward loop, the craving never fully cements. Pain relief, improved mobility, the sensation of walking out of a session feeling lighter, these are genuine, potent rewards. But if the loop breaks before craving is established, the reward becomes an abstract memory rather than an active neurological pull. The patient doesn't stop valuing their health; they simply stop feeling the pull toward the behaviour that would support it.

Research in behavioural neuroscience consistently distinguishes between 'wanting' and 'liking', a distinction that neuroscientist Kent Berridge has studied extensively at the University of Michigan. Wanting (craving) is driven by dopamine systems and is what compels action. Liking (enjoyment of the reward) is a separate system. A patient can intellectually 'like' the idea of feeling better without the dopaminergic 'wanting' that actually drives them to book. Your re-engagement strategy, then, must target the wanting system, not just remind patients that physiotherapy is good for them, but trigger the visceral, sensory memory of the reward itself.

The Research

How to Apply This in Your Practice

The first step in applying this principle is understanding what specific reward your lapsed patients are craving, or more accurately, what reward they have stopped craving because the sensory memory has faded. For a physio patient, it might be the sensation of walking without a limp after a session. For a chiro patient, it could be the release of tension through their thoracic spine that let them sleep properly for the first time in weeks. For a podiatry patient, it's possibly the simple pleasure of walking to the car without wincing. Your re-engagement communication must target this specific, sensory, felt experience, not the abstract concept of 'better health' or 'managing your condition.'

The most effective message you can send a lapsed patient isn't 'We haven't seen you in a while, time to book your next appointment.' That message addresses the routine without activating the craving. Instead, craft your outreach to trigger the sensory memory of the reward directly. A message like: 'Do you remember how you felt walking out after your last session with us? That looseness in your shoulders, the way you moved differently? That feeling is literally one appointment away, and we have a spot this Thursday at 10am' is doing something neurologically distinct. It is attempting to fire the anticipatory dopamine response by making the reward vivid and proximate. This is craving activation, not mere reminder marketing.

From a workflow perspective, your practice management system should flag patients who haven't booked within a clinically appropriate window, typically 8 to 16 weeks depending on their condition and treatment plan. At that trigger point, an automated but personalised message sequence should begin. The first touchpoint should lead with the reward memory, as described above. If there's no response after five to seven days, a second message can layer in social proof or mild urgency: 'A lot of our patients find that the gains from their last course of treatment start to quietly reverse around this point, coming back now means you're protecting the progress you already made.' This message activates a different but related craving: the desire to protect something of value, a principle well-documented in loss aversion research.

Practitioners can also embed craving-activation into the clinical encounter itself to make future re-engagement easier. At the end of each session, take thirty seconds to help the patient articulate and internalise the reward: 'How are you feeling right now compared to when you walked in?' Let them name the sensation in their own words. Some practices are now prompting patients to record a short voice note on their phone describing how they feel post-session. When that patient lapses and receives a re-engagement message weeks later, they can replay their own voice describing their own reward. There is no more personally resonant craving trigger than your own past experience narrated in your own words.

Seeing It in Action

Your Action Plan

1. 1Audit your patient records to identify anyone who hasn't booked within 8-16 weeks of their last appointment, and tag them as lapsed, this is your re-engagement list and the starting point for applying craving-based outreach.
2. 2Train your clinicians to spend 30-60 seconds at the end of each session helping patients vocalise and internalise the reward, ask directly, 'How do you feel now compared to when you walked in?' and document their exact words in the patient notes for use in future re-engagement messages.
3. 3Rewrite your re-engagement message templates to lead with the sensory memory of the reward rather than an administrative reminder, reference the specific feeling the patient experienced, use their language where possible, and make the reward feel proximate and achievable rather than distant.
4. 4Build a two-to-three touchpoint automated sequence triggered at your lapsed-patient threshold, the first message activates the reward craving, the second (sent 5-7 days later if no response) layers in loss aversion by noting that treatment gains can reverse, and the third offers a low-friction re-entry point such as a shorter check-in appointment.
5. 5Review your re-engagement response rates quarterly and test variations in your reward-language, different patient cohorts (e.g. sports injury vs. chronic pain vs. post-surgical) will have different peak rewards, so segment your messaging to match the specific sensory experience most relevant to each group.