A six-step forest bathing guide, the seasons in Lapland, and what has actually been measured about forest bathing, awe walks, ice swimming and the polar night.
Does forest bathing actually work, or is it just a marketing term for a walk? The effect has been measured, but the evidence is weak — and it does not directly answer whether forest brings anything on top of an ordinary walk. Two 2026 meta-analyses land on different notes. Andrade et al. pooled 11 studies, of which 10 were quasi-experimental before-and-after designs and only one a randomised trial: heart rate fell by an average of 4.00 beats per minute (95 per cent CI −6.90 to −1.09; I² 10 per cent), and on the POMS mood questionnaire, tension fell by 0.79 points and dejection by 0.68 — these are questionnaire points, not standardised effect sizes. Certainty of evidence was very low on the GRADE scale for every outcome. The same review also contains these results: the one objective stress marker did not fall, since salivary cortisol showed no meaningful change and the point estimate actually pointed to a slight rise (MD 0.09; CI 0.03–0.15) with heterogeneity of I² 99 per cent, and the STAI anxiety questionnaire (−6.15; CI −15.71 to 3.40), diastolic blood pressure (−2.28; CI −4.85 to 0.29), vitality and positive affect did not change statistically significantly. So the drop showed up precisely where a person rates their own state, knowing they are in a forest. Qin et al. measured something broader than forest bathing: 25 studies and 1,876 participants, with direct exposure to a forest environment as the inclusion criterion, ranging from 15-minute visits to 12-week guided programmes, and participants included clinical groups such as patients with depression, anxiety, burnout and PTSD. Stress fell by an SMD of −0.71 (−0.89 to −0.53), depressive symptoms by −0.68 (−0.86 to −0.50) and anxiety symptoms by −0.77 (−0.97 to −0.57), and the quality of evidence was moderate for stress and low for the emotional-symptom outcomes. So not just a marketing term, but not a treatment either: Andrade's own authors write that forest bathing should be interpreted as a complementary health-promotion practice, not as a standalone preventive or therapeutic measure. The limits: neither study gives a direct answer to whether this is just walking, since Andrade's review did not analyse urban control groups at all and rests almost entirely on before-and-after measurements, so its figures do not separate forest from walking, or from a change of environment in general; Qin's studies did require a control group, but the content of the intervention varied widely. Almost all outcomes are self-completed questionnaires, and blinding participants is not possible. Andrade's follow-up went no further than 24 hours after exposure, and in Qin's review virtually all measurements were taken immediately after the intervention ended, so there is no evidence on long-term effects. Heterogeneity was in places extremely high: in Andrade's results section the range for psychological measures runs 10–92 per cent, and for cortisol 99 per cent, while the heart-rate finding quoted above is consistent. This is a short-term change in mood and heart rate, not the treatment of a disease.
What is the practical difference between forest bathing and ordinary hiking? The measurable difference is small, and neither available study actually compares forest bathing with hiking. In a Brazilian quasi-experimental pilot study, 56 people were recruited, but only 35 were measured through to the end: 23 in the forest group and 12 in the control group. The forest group attended eight guided forest-bathing sessions over eight weeks, while the control group had a roughly 40-minute urban-environment exposure but met only twice, at the start and the end. There was no significant difference between the groups in systolic (p = 0.569) or diastolic (p = 0.583) blood pressure, and salivary cortisol fell more in the forest group than in the control group (−0.13 vs. −0.07 µg/dl, p = 0.024). The design carries two confounders the authors themselves report: the groups were not randomised but assigned in order of enrolment, so that the first people to sign up went into the forest group, and the forest group met four times as often as the control group. So this is not a clean forest-versus-city comparison. In a Finnish randomised crossover pilot trial, 22 students did not walk in a forest at all: they sat or stood for 15 minutes looking at a snow-covered spruce-forest landscape, and, on the same day, at a similarly constructed winter landscape used as a control. Negative mood indices fell after viewing the forest landscape and rose after viewing the control landscape, but vigour and subjective vitality did not increase significantly in the forest — they fell in the control environment. So the advantage for the forest arises partly from the built environment making people feel worse, not solely from the forest making them feel better. The practical difference between forest bathing and hiking lies in the instructions, not in the measurement results: forest bathing is short, slow and full of pauses, with attention directed to the senses, while hiking aims at covering distance and reaching a destination. This difference has not been measured in an experimental design — it is a way of doing things, not a studied superiority. The limits: the Brazilian study is a non-randomised pilot in a tropical savanna climate (21.6–24 °C), 35 participants were analysed, and dropout was 17.9 per cent in the forest group and 36.8 per cent in the control group, and the authors themselves name the small sample and the asymmetry between groups as limitations. Within the forest group, systolic blood pressure fell (median 119.5 to 108.0 mmHg, p = 0.001), but because there was no difference between the groups, the change cannot be credited to the forest. Bielinis's trial is randomised but very small: 22 students, one day (29 January, −7.2 °C, 20–25 cm of snow), one stand of trees, a 15-minute viewing session, and self-report questionnaires alone, with no physiological measurements. No study has compared structured forest bathing with hiking or with a slow forest walk. These are research findings, not treatment promises and not health recommendations.