I have a mild tendency to justify my travel habits using psychology research. I am aware of this. I have made my peace with it. So when I came across a 2024 study applying the theory of entropy to tourism and finding that positive travel experiences may actually slow some signs of ageing, I did […]
I have a mild tendency to justify my travel habits using psychology research.
I am aware of this. I have made my peace with it.
So when I came across a 2024 study applying the theory of entropy to tourism and finding that positive travel experiences may actually slow some signs of ageing, I did not read it with detached academic interest. I read it the way a person reads a doctor's note that says exactly what they were hoping to hear.
I may have screenshot it immediately. I may have sent it to three people with zero context.
What can I say. The science supports my lifestyle choices. I will not be taking questions.
But underneath the self-satisfaction, something genuinely interesting is going on — and it starts with a concept that has nothing to do with travel at all.
What entropy actually means
Entropy, in physics, describes the universe's slow drift toward disorder. Left to themselves, organized systems break down. Heat disperses. Structure loosens. Things tend, over time, toward randomness rather than coherence.
I cannot describe how much I have always loved this concept. I love the idea that disorder is not a failure of the system but the natural direction of things. That falling apart is, in some fundamental sense, what everything is doing all the time.
I encountered it first in a physics class and have been quietly returning to it ever since, the way you return to a sentence that keeps meaning something new.
So when researchers at Edith Cowan University asked whether that same principle could describe what happens inside the human body as it ages, I was already paying attention.
The study, published in the Journal of Travel Research and led by PhD candidate Fangli Hu, proposed exactly that. Aging, from an entropy perspective, is the body's gradual movement toward biological disorder — declining metabolic efficiency, weakening immune function, reduced capacity for self-repair. The researchers argued that positive travel experiences may help the body resist that drift, supporting the self-organizing systems that keep us functioning well. The study is theoretical rather than clinical — it proposes a framework rather than measuring biological markers directly — and is best read as a direction for future research rather than a settled finding.
"Ageing, as a process, is irreversible," Hu noted. "While it can't be stopped, it can be slowed down."
Three reasons travel works as a counter-entropy force
The study identifies three overlapping mechanisms through which travel may slow entropic processes in the body.
The first is novelty.
New environments expose the body to unfamiliar stimuli — new microbiomes, new physical demands, new sensory input — which can trigger adaptive immune responses and elevate metabolic rates. The body is essentially asked to reorganize itself in response to the unfamiliar, which keeps its self-organizing capacities active. A nervous system that keeps encountering new information has to stay flexible. Flexibility, at the biological level, is the opposite of entropy.
The second mechanism is physical activity.
Most travel involves more movement than ordinary life — walking unfamiliar streets, hiking, swimming, navigating new cities on foot. This kind of incidental, embodied movement has well-established effects on metabolic health and immune function. The body staying in motion is the body resisting stasis.
The third is the low-entropy effect of genuine rest.
Leisurely travel — watching a sunset, reading somewhere quiet, sitting in a café without an agenda — moves the body out of its chronic stress state. It calms immune overactivation, reduces cortisol, and allows the body's repair systems to work properly. "Organs and tissues can then remain in a low-entropy state," Hu explained.
What fascinates me about this triad is how closely it maps onto what people actually describe when they talk about feeling alive on a trip. The movement. The novelty. The particular quality of rest that only seems to arrive when you have genuinely left your ordinary life behind.
What this means for the brain, specifically
The entropy framework connects naturally to what neuroscience has been finding separately about novelty and the ageing brain.
Brain entropy — the complexity and variability of neural activity — decreases with age. A younger brain generates more varied, flexible signal patterns. An older brain, left unstimulated, tends toward less complex, more repetitive activity. This neural dedifferentiation is linked to cognitive decline and reduced emotional flexibility.
Novel environments counteract this. New places, new social configurations, new sensory landscapes force the brain to generate new patterns rather than defaulting to familiar ones. The brain that keeps encountering the unfamiliar is a brain that keeps working at full complexity.
This is part of why travel can feel so cognitively clarifying. It is not only rest. It is a particular kind of activation — the kind that comes from a nervous system being asked to do something genuinely new.
The honest caveat
The researchers are careful about the limits of their claims, and it is worth being honest about those limits too.
The 2024 study is theoretical rather than clinical. It proposes a framework rather than measuring biological markers directly. Follow-up work published in 2025 described travel therapy as promising but still emerging, and called for clearer methodologies before the field draws firm conclusions. The same researchers also noted that not all travel is restorative — stressful itineraries, unsafe conditions, illness abroad, and exhausting schedules can increase entropy rather than reduce it.
The kind of travel that seems to support health is not the kind that involves seventeen flights in ten days with zero downtime. It is the kind that includes real rest alongside novelty, physical engagement alongside stillness, social connection alongside solitude. Most people who travel thoughtfully already know the difference intuitively. The study gives that intuition a theoretical structure.
What we actually miss when we come home
I keep returning to the novelty piece, because I think it explains something that post-travel flatness research has only partially captured.
When I am away, my nervous system is genuinely busy. Not anxiously busy — the opposite of that. Alert, present, engaged with the immediate. The body is warm or tired from walking. The day is full of small decisions about where to eat and which street to take. Nothing is automatic.
Coming home means returning to a life the brain has already largely mapped. The commute, the routine, the apartment organized exactly as expected. There is comfort in that. But there is also a kind of neural quieting that can feel like flatness, especially in the first days back. What the entropy framework suggests is that this isn't purely emotional — the biological systems that were being gently activated have also returned to baseline. The body is less challenged. Less organized in response to something new.
This doesn't mean ordinary life is unhealthy. It means that the particular quality of aliveness that travel produces has real physiological correlates, not just emotional ones.
The rationalization I was looking for
I want to be transparent: I came to this research with an agenda. I travel more than is strictly defensible on an academic salary, and I have been quietly looking for peer-reviewed support for this decision for some time.
I have now found it. The science says that novel environments, physical movement, genuine rest, and social connection may help slow biological ageing by keeping the body's self-organizing systems active. It says that a nervous system encountering the unfamiliar is a nervous system staying flexible. It says that the quality of aliveness people describe on trips has measurable biological underpinnings — or at least, a credible theoretical framework for why it might.
I am choosing to take this at face value. My next flight is, in this framing, a health intervention.
I recognize this is exactly the kind of motivated reasoning a psychologist should not engage in. I am engaging in it anyway. The entropy study says I am probably fine.
