Where Shinrin-yoku Came From
The term shinrin-yoku — roughly translated as 'forest bathing' or 'taking in the forest atmosphere' — was coined by Japan's Ministry of Agriculture, Forestry, and Fisheries in 1982. It was introduced partly in response to rising rates of stress-related illness linked to rapid urbanization and long working hours. The government framed forest immersion as a preventive health measure and began funding scientific research to examine its physiological and psychological effects.
By the 1990s and 2000s, Japanese researchers — most notably a team led by environmental health scientist Qing Li at Nippon Medical School — had begun publishing studies examining how time among trees affected measurable biological markers. Their work helped shift the concept from cultural practice to a subject of formal scientific inquiry, and interest spread to South Korea, Finland, and eventually the broader international research community.
Today, the practice has been adopted and adapted in many countries, sometimes under the broader label of 'nature therapy' or 'green prescribing,' where healthcare providers in some countries recommend structured time outdoors as a complement to conventional care. For a broader look at how wellness practices move from the fringes into clinical conversations, see how other modalities have traveled this path.
What the Research Suggests — and Where It's Limited
The most frequently cited findings in shinrin-yoku research involve reductions in salivary cortisol (a marker of stress), lower blood pressure and heart rate, and improved scores on self-reported mood and anxiety scales when participants spent time in forested environments compared to urban settings. A widely referenced review published in Environmental Health and Preventive Medicine synthesized multiple Japanese studies and found consistent trends across these physiological measures.
One proposed biological mechanism involves phytoncides — volatile organic compounds released by trees, particularly conifers. Laboratory research has suggested that exposure to phytoncides may influence immune function, including activity of natural killer (NK) cells, which play a role in the body's defense systems. However, it is worth noting that linking phytoncide inhalation to meaningful clinical health outcomes in humans remains an active area of inquiry rather than settled science.
2 hrs/week
Nature time linked to better self-reported wellbeing
A 2019 study in Scientific Reports found this threshold associated with meaningfully higher wellbeing scores across diverse population groups.
~50%
Reduction in cortisol levels observed in some forest studies
Several Japanese studies measured salivary cortisol before and after forest walks, with some reporting substantial reductions compared to urban control conditions.
64%
Of global population projected to live in urban areas by 2050
UN population projections highlight the growing relevance of green space access as urbanization accelerates worldwide.
A 2019 analysis published in Scientific Reports drew on survey data from tens of thousands of participants and found that people who spent at least two hours per week in natural settings reported significantly better health and wellbeing than those who spent no time outdoors. The association held across different age groups, occupations, and health statuses — though as an observational study, it cannot confirm causation.
Critically, many individual studies in this field have notable limitations: small sample sizes, self-selected participants, short intervention periods, and challenges in isolating the 'nature' effect from exercise, sunlight exposure, or simply taking a break from screens and workplaces. Researchers have called for larger, more rigorously controlled trials. Those interested in evaluating any wellness practice more systematically may find the framework in this evidence assessment guide a useful reference.
Nature's Contrast With Digital Environments
Part of the growing interest in forest bathing coincides with concerns about the mental health effects of constant digital connectivity. While the relationship between technology use and wellbeing is itself contested — as examined in a closer look at what social media research actually shows — time in natural settings represents a deliberate withdrawal from screen-based environments.
Some researchers suggest that natural environments may offer what psychologist Stephen Kaplan described as 'restorative' qualities — spaces that allow the directed-attention systems the brain uses for focused work to recover passively. This 'attention restoration theory' remains influential in environmental psychology, though it is one of several competing frameworks used to explain why nature exposure appears to affect mood and stress.
You Don't Need a Forest to Start
Urban parks, botanical gardens, and even tree-lined streets can provide meaningful contact with natural elements. Research suggests that intentional attention to your surroundings — noticing birdsong, the texture of bark, or the quality of light — may be as important as the specific setting. Starting with whatever green space is accessible to you is a reasonable first step.
What does seem consistent across studies is that the benefits of nature exposure are not exclusive to remote wilderness. Urban parks, community gardens, and tree-lined neighborhoods have all been associated with measurable wellbeing indicators in public health research — a relevant consideration given that access to forests is far from universal. Equity in green space access has become an increasingly prominent topic in urban planning and public health literature.
Putting the Evidence in Perspective
Forest bathing occupies a credible, if still developing, position in the wellness research landscape. The evidence is stronger than anecdote but not yet robust enough to support sweeping clinical recommendations. It is best understood as a general health-supportive practice — one that carries minimal risk for most people and is broadly accessible in principle, even if not always in geography.
Nature therapy does not substitute for professional mental health care, treatment of chronic conditions, or other evidence-based interventions. For people managing anxiety, depression, or other health conditions, it is worth discussing any new wellness practice with a healthcare provider. The practice may also intersect with travel choices — readers interested in how spending time in natural environments connects to sustainable and restorative approaches to tourism may find the concept of regenerative tourism a related area of interest.
This article is for general informational purposes only and does not constitute medical advice. Readers should consult a qualified healthcare professional regarding any health concerns or before making changes to their health practices.
Frequently Asked Questions
Forest bathing prioritizes slow, mindful sensory awareness rather than physical exercise or reaching a destination. Hikers typically focus on distance, pace, or terrain. In shinrin-yoku, the emphasis is on being present in the environment — noticing smells, sounds, and light — rather than movement goals.
Several studies, many conducted in Japan and South Korea, have found associations between time in forested environments and lower cortisol levels, reduced blood pressure, and improved self-reported mood. However, many of these studies are small-scale, and researchers note that more large, controlled trials are needed before drawing firm conclusions.
Research suggests that various natural environments — parks, gardens, shorelines — can offer some comparable benefits, though forested settings are most commonly studied. Urban green spaces have also been associated with measurable wellbeing benefits in public health research.
Studies vary widely in the duration they examine, from 20-minute sessions to multi-day retreats. A frequently cited analysis suggested that roughly two hours per week in nature was associated with better self-reported health and wellbeing, though individual responses differ and no single prescription applies universally.
Some studies report improvements in self-reported mood, anxiety, and stress following nature exposure, but forest bathing is not a clinically validated treatment for anxiety or depressive disorders. Anyone managing these conditions should work with a qualified healthcare professional rather than relying solely on any wellness practice.
Several organizations offer forest therapy guide training, though there is no single universal certification standard. Guided sessions may help beginners engage more intentionally with the practice, but independent, unstructured time in natural settings also appears to confer benefits based on existing research.
The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.