Between wellness trend and science – what time in nature demonstrably does for you
«After a walk in the forest I feel like a different person.» – «Forest bathing? Isn’t that just walking with an expensive name?» – «I don’t have time for nature during the week.»
Most of us move somewhere between those three sentences. Forest bathing – mindful, slow time in the woods on the Japanese model (shinrin-yoku) – has long been a trend with courses, books and big promises. So it’s time to look honestly: what is well evidenced scientifically, what is preliminary – and what is marketing?
1. The 120-minute mark: a remarkable number
Perhaps the most important study on the subject comes from Mathew White and colleagues (2019). They analysed data from almost 20,000 people in England and found that those who spent at least 120 minutes a week in nature reported good health and high well-being significantly more often. Below that mark, barely any difference from people with no contact with nature was measurable; above roughly 200 to 300 minutes the association levelled off.
Two details make the study practical: first, it made no difference whether the two hours came in one go or spread across the week – five times 25 minutes counts just as much as one long Sunday hike. Second, the association held across age and income groups.
Worth putting in perspective: this is a cross-sectional study. Time in nature is associated with better health – whether it causes it, this study cannot prove. Perhaps healthier people simply go outside more often. The 120 minutes are therefore a good orientation, not a proven threshold.
2. The «nature pill»: even 20 minutes has a measurable effect
Closer to the cause-and-effect question is a study by MaryCarol Hunter and colleagues (2019): over eight weeks, participants regularly built short nature contacts into their daily lives while their stress hormone cortisol was measured in saliva. The result: even 20 to 30 minutes in nature lowered cortisol levels measurably – the researchers spoke of a «nature pill». Longer did continue to help, but the strongest effect per minute was in that first half hour.
There are indications for blood pressure too: a meta-analysis by Ideno and colleagues (2017) found lower blood pressure values in forest environments compared with urban ones. And the Japanese shinrin-yoku studies report reduced salivary cortisol and increased heart rate variability – a sign of relaxation. In fairness it must be added: many of these studies have small samples and moderate methodological quality. The direction is right, the precision isn’t there yet.
3. Why nature restores us: the attention explanation
The most cited theory in environmental psychology offers an elegant explanation: attention restoration theory by Rachel and Stephen Kaplan (1989). Their idea: our daily life demands directed attention constantly – concentrating, focusing, suppressing distractions. This ability tires like a muscle.
Nature, by contrast, offers «soft fascination»: rustling leaves, play of light, a stream – stimuli that hold our attention effortlessly without taxing it. That’s exactly how directed attention can recover. It explains why a walk in the woods feels different from «relaxing» for an hour in front of a screen: one charges the battery, the other only keeps it on standby.
4. Staying honest: what gets overstated
So that this article is more than an advert for greenery, this needs saying too:
- Phytoncides and the immune system: The claim that essential compounds from trees strengthen our immune cells or even protect against cancer rests on very small, preliminary studies. Nobody may sell that as established.
- «Forest therapy» as medicine: Forest bathing is not a recognised medical therapy and replaces no treatment – neither for depression nor for high blood pressure.
- It doesn’t have to be a forest: The research by White and Hunter speaks of nature in general. The park around the corner, the lakeshore, the planted courtyard – contact with nature counts, not the species of tree. Having no forest on your doorstep is no disadvantage.
5. How to get your nature time – without effort
🟢 Think in weekly minutes, not in outings. 120 minutes a week sounds like a lot – two 25-minute walks at lunchtime plus an hour at the weekend, and you’re there.
🟢 Make nature time mindfulness time. Phone in your pocket, slow down, senses open: what do you hear, what do you smell, what do you see? That way you combine two well-evidenced factors. Simple exercises for this can be found in the article Simple mindfulness exercises for everyday life.
🟢 Use transitions. Get off the tram a stop early and walk through the park, take that phone call outside while walking – nature minutes hide inside journeys you’re making anyway.
🟢 Try it guided. If you’d like to experience mindful walking in the forest with guidance once: that’s exactly what my evening mindfulness forest walk is for.
Conclusion
Forest bathing is neither a miracle cure nor humbug. The research paints a pleasingly clear picture: around two hours of nature a week is associated with better health and more well-being, even 20 to 30 minutes measurably lowers the stress hormone cortisol, and attention research explains why your head clears outdoors. The big immune promises may safely be taken with caution – the walk itself, though, without any reservation at all.
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