- Tension: Society tells older adults to slow down and rest, but the biology of healthy ageing responds most powerfully to the opposite.
- Noise: The “relaxing holiday” framing has obscured decades of research showing that challenge, novelty, and disorientation are what drive the biological systems that keep us vital.
- Direct Message: Travel doesn’t support healthy ageing despite being demanding — it supports healthy ageing precisely because it is.
To learn more about our editorial approach, explore The Direct Message methodology.
Most of what gets written about travel and health focuses on the obvious: it reduces stress, it broadens perspective, it makes you feel better for a while. These things are true, and they are also incomplete.
A 2024 study published in the Journal of Travel Research took a different angle. Researchers at Edith Cowan University applied the theory of entropy — the tendency of physical systems to drift toward disorder — to what travel actually does inside the body. The study is theoretical rather than clinical: it proposes a framework for understanding biological ageing through an entropy lens, rather than measuring biomarkers directly in a controlled trial. What it offers is a way of thinking about four biological systems that rarely get discussed in the same conversation — and why travel may engage all of them simultaneously.
The lead researcher, PhD candidate Fangli Hu, put it plainly: “Ageing, as a process, is irreversible. While it can’t be stopped, it can be slowed down.”
What follows is what the research proposes about how travel might contribute to that slowing — and why the mechanism matters as much as the outcome.
1) The immune system
Novel environments expose the body to unfamiliar microbial landscapes, new allergens, different air, different physical demands. This is not the same as getting sick abroad. It is a subtler biological event: the immune system encountering the unfamiliar and recalibrating in response.
The ECU study proposes that this kind of adaptive stimulation may keep immune function more flexible and responsive — the opposite of the immune stagnation that can develop in highly controlled, repetitive environments. The framework draws on a broader principle in immunology: that moderate, varied environmental exposure is associated with immune resilience, while chronic physiological sameness may over time reduce the immune system’s adaptive range. Travel, the researchers argue, provides a form of biological variety that ordinary life rarely does.
2) The metabolic system
Physical activity is one of the most consistent predictors of healthy metabolic function across the lifespan, and most travel involves significantly more movement than ordinary daily life — walking unfamiliar streets, navigating cities on foot, hiking, swimming, carrying bags up stairs in apartments without lifts.
This kind of incidental, embodied movement is different from scheduled exercise. It is movement that happens in response to the environment rather than in spite of it. The body is not on a treadmill. It is responding to the actual demands of a place, which tends to produce a different quality of physical engagement.
The study proposes that novel environments may elevate metabolic rates and support the body’s self-organizing capabilities — the processes through which cells repair, regulate, and maintain structural coherence. Metabolic activation at moderate levels is, in this framework, one of the more reliable ways to slow the kind of metabolic drift associated with ageing.
3) The stress response system
Chronic stress accelerates biological ageing through several pathways — elevated cortisol, increased inflammatory markers, shortened telomeres, disrupted sleep architecture. This is well-established. What is less often discussed is the specific kind of rest that actually reverses it.
Not all rest is equal. Lying on a sofa at home, surrounded by the visual cues of everything waiting to be done, does not produce the same physiological state as sitting at a cafe table in an unfamiliar city with no particular obligation attached to the afternoon. The latter moves the body more reliably out of its chronic threat-activation state.
The ECU researchers describe this as travel’s capacity to induce a low-entropy state — a condition in which the body’s stress-response systems quiet down enough for genuine repair to occur. “This relief helps maintain the body’s metabolic balance and increases the anti-wear-and-tear system’s effectiveness,” Hu explained. “Organs and tissues can then remain in a low-entropy state.”
The distinction matters because stress recovery is not just about feeling better. It is about giving the biological repair systems time and conditions to actually work.
4) The psychological and emotional system
The fourth mechanism is the least tangible and possibly the most significant.
Positive emotions — curiosity, wonder, warmth, a sense of aliveness — have documented associations with immune function, cardiovascular health, and longevity in the psychological literature. They are not merely pleasant. They are physiologically active. And travel, when it is genuinely restorative rather than exhausting, tends to produce them with unusual consistency.
The study points to social connection as one contributing factor: meeting new people, navigating unfamiliar social contexts, experiencing the particular warmth of being a stranger somewhere welcoming. These experiences generate positive affect in ways that are hard to replicate through routine.
There is also the matter of what psychologists call self-expansion — the sense of the self becoming larger through encounter with the genuinely new. Novel experiences that produce meaning, not just stimulation, seem to have measurably different effects on wellbeing than novelty alone. Travel at its best combines both: the sensory immediacy of a new place and the quieter sense that something in you has shifted in response to it.
What the research does and does not claim
The ECU study is theoretical rather than clinical, and its findings should be read accordingly. It proposes a framework rather than measuring biomarkers directly in a controlled trial. Follow-up work from 2025 described travel therapy as a promising but still-emerging field, and called for stronger methodologies before firm conclusions are drawn.
The researchers are also careful to note that not all travel produces these effects. Stressful itineraries, unsafe conditions, illness, and exhausting schedules can increase entropy rather than reduce it. The health-supporting effects seem to emerge specifically from travel that combines novelty with genuine rest, physical engagement with unhurried time, and social connection with sufficient solitude.
The more useful takeaway may not be “travel more” but something more precise: that the body responds to a particular combination of inputs — novelty, movement, stress recovery, and positive emotion — that travel tends to deliver together in ways ordinary life rarely does.
Why this framing matters
Most wellness advice addresses one system at a time. Take more steps. Manage your stress. Eat for your immune system. Stay socially connected. These recommendations are not wrong. They are just delivered in separate boxes, as though the body operated in separate boxes too.
What the entropy framework does is name something the body already knows: that these systems are not independent. They activate and decline together. And experiences that engage all of them simultaneously — which is what restorative travel tends to do — may have compounding effects that no single intervention replicates.
Ageing is a process the body is always involved in. The question the ECU study raises is not whether it can be stopped, but whether there are ways of living that keep the body’s organizing capacities more resilient, more flexible, and more capable of resisting disorder for longer.
Travel, done thoughtfully, may be one of them.
