There is a reason so many people feel flatter in winter. Not just tired, not just cold, but genuinely less themselves. The days shorten, the light changes, and something shifts in the background of how you feel. It is not imaginary. It is biology.
The good news is that the same science that describes why winter affects mood also points clearly towards what helps. And a walking holiday in the Mediterranean, it turns out, addresses several of the key factors involved.
The case for walking outdoors in winter is not just intuitive. There is a growing body of research that supports it.
When daylight decreases, your brain registers the change. Sunlight stimulates the hypothalamus, which helps govern your circadian rhythm, your internal 24-hour clock. Less light can disrupt that rhythm, which in turn affects sleep, energy, and mood.
Research has observed seasonal patterns in serotonin, a neurotransmitter closely associated with mood regulation. A study by Lambert et al., which measured serotonin turnover in 101 healthy men across twelve months, found it to be lower in winter and associated with the duration of sunlight. The relationship between light, serotonin and mood is not a simple on/off switch, and the mechanisms are still being studied, but the seasonal association is consistent across multiple lines of research.
Melatonin, the hormone that signals sleep, tends to be produced in greater quantities during the longer nights of winter. The result is a familiar pattern: heavier mornings, earlier fatigue, a general sense of running at lower capacity.
This is the biological context for what researchers call seasonal affective disorder (SAD), a form of depression with a seasonal pattern, and for the milder "winter blues" that many more people experience without a clinical diagnosis. Light exposure is an established component of treatment for SAD, particularly morning light therapy, and physical activity outdoors is consistently recommended alongside it.
There is a third factor worth noting. Vitamin D is synthesised in the skin through UVB radiation from sunlight. In winter at northern latitudes, the angle of the sun reduces UVB intensity, and multiple studies have found associations between lower vitamin D levels and depressive symptoms. The relationship is not straightforward, and the evidence on vitamin D as a treatment for seasonal depression remains mixed.
Understanding the problem points towards a response. If disrupted circadian rhythms, reduced light exposure and lower physical activity are all associated with winter low mood, then increasing time outdoors and movement, together, is a reasonable and well-supported approach.
A 2025 study involving more than 13,000 adults with depression found that greater self-reported daylight exposure was associated with lower depressive and insomnia symptoms. The researchers were careful to note that the relationship is observational and that causality remains to be established, but the pattern was consistent across the sample.
A 2022 study published in the International Journal of Environmental Research and Public Health compared outdoor walking with indoor relaxation exercises across both summer and winter conditions. Walking outdoors in winter was associated with significantly increased subjective vitality and psychological detachment from work, while the indoor relaxation group showed no comparable effect on psychological detachment.
Taken together, the research gives us good reason to see winter walking as more than simply an enjoyable way to spend time outdoors. Natural light, movement and time outside are each associated with aspects of wellbeing that tend to diminish in winter.
The research above is not specific to any destination. But destination matters in a practical sense.
At northern European latitudes in December, the days are short and the sun stays low. Even people who want to spend time outdoors may find the conditions limiting: cold, dark mornings, early sunsets, and temperatures that make multi-hour walks uncomfortable. The cumulative dose of light and movement available on a typical winter day is simply lower.
Destinations further south offer longer days and, in many cases, temperatures that make extended outdoor walking genuinely pleasant through the winter months. The Malta and Gozo Coastal Trail operates from January through May and September through December. The Aegina Short Break in Greece is available year-round. The Cilento Coastal Walk extends into November. These itineraries make it possible to build several hours of outdoor walking into a winter trip, something that can be harder to achieve during everyday life in a northern European winter.
We are not claiming that a walking holiday is a treatment for anything. But the conditions it creates, sustained outdoor movement, natural daylight across the day, and a genuine break from routine, are the same conditions that the research consistently associates with better winter wellbeing.
There is one more part of a walking holiday that is harder to measure but easy to recognise: the change of rhythm that comes with stepping away from ordinary life.
On a walking trip, the demands on your attention become immediate and physical: the path, the landscape, the next village, the evening meal. Research into outdoor walking has explored this in terms of psychological detachment and restoration. In the 2022 study mentioned above, both winter and summer outdoor walks were associated with increased psychological detachment from work and subjective vitality.
A walking holiday takes that change of context much further than a lunchtime walk. We cannot assume that the effects are identical, but the principle is relevant: movement outdoors can create space between you and the routines that normally occupy your attention.
This is not unique to the Mediterranean. But a walking holiday combines several things that research independently associates with wellbeing: time outdoors, regular movement, natural daylight and a genuine change of environment.
We are not suggesting that a walking holiday is a treatment for clinical depression or seasonal affective disorder. If you are experiencing significant symptoms, the right first step is always to speak to a doctor.
But for the much larger group of people who simply feel less well in winter, flatter, more tired, less motivated, the evidence is encouraging. Outdoor light exposure and physical activity are well-supported approaches to managing the season. Doing them in a place where the days are longer, the conditions are manageable, and the landscape gives you something to pay attention to is a reasonable way to make the most of both.
The Mediterranean in autumn and winter is not a prescription. But it does create something many of us get too little of during the darker months: long stretches of time outdoors, natural daylight, regular movement, and a genuine change of rhythm.
Planning a walking trip this autumn or winter? Browse our Mediterranean itineraries or get in touch with the SloWays team to find a route that suits your dates, your fitness level, and the season. We will take care of the logistics. You bring the walking shoes.
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