America Had Its Own Forest Healing Tradition — And It Was Prescribing Nature a Century Before Japan Made It Famous

The Wellness Trend That Isn't Actually New

Walk into almost any bookstore's health section and you'll find at least one title about shinrin-yoku — the Japanese concept of spending deliberate, mindful time among trees. It's been covered in The New York Times, recommended by therapists, and packaged into guided retreats that charge several hundred dollars a weekend. The science backing it up is real: studies have consistently shown that time in forested environments lowers cortisol levels, reduces blood pressure, and improves mood in ways that a walk through an urban park simply doesn't replicate.

But here's the thing nobody mentions in those wellness articles: American doctors were prescribing almost exactly this — immersive time in wild, forested nature as a medical treatment — as far back as the 1880s. They didn't call it forest bathing. They didn't call it much of anything, really. But what they were doing was remarkably similar, and the story of how it happened and why it got forgotten is one of the more curious gaps in American health history.

John Muir, Unlikely Physician

John Muir is remembered as a conservationist, a writer, a founder of the Sierra Club. What gets less attention is the frequency with which he described wilderness immersion in explicitly therapeutic terms — not just poetically, but almost clinically.

In his journals and letters from the 1870s and 80s, Muir repeatedly described the restorative effects of extended time in the Sierra Nevada with a specificity that reads less like nature writing and more like a case study. He wrote about the way exhaustion lifted after days in the high country, the way anxiety dissolved in the presence of old-growth trees, the physical sensation of what he called "going out" into wild nature as a kind of reset for the nervous system.

He wasn't alone in this observation. A loose network of naturalists, physicians, and public health advocates in the late 19th century were arriving at similar conclusions through different routes. The overlap between the American conservation movement and early public health thinking was, during this period, surprisingly significant.

The Sanitarium Era Nobody Remembers

From roughly the 1880s through the 1920s, a particular kind of institution flourished in the American landscape: the outdoor sanitarium. These weren't the grim psychiatric facilities the word conjures today. Many of them were essentially what we'd now call wellness retreats — places where patients with nervous exhaustion, respiratory illness, or what physicians of the era called "neurasthenia" were sent to recover through structured time outdoors.

The Adirondacks became a center of this practice. The work of Dr. Edward Trudeau, who established his famous sanitarium at Saranac Lake, New York, in 1884, drew national attention partly because of his tuberculosis treatment protocols — but also because of his insistence on outdoor air, forest surroundings, and what he described as the healing properties of the natural environment itself. His patients spent hours each day outside, in all seasons, surrounded by the Adirondack forest.

Similar institutions operated in the mountains of North Carolina, the pine forests of the upper Midwest, and the high desert of New Mexico and Arizona. The specific conditions being treated varied, but the prescription was remarkably consistent: get the patient out of the city, into trees, and let nature do something that medicine alone apparently couldn't.

What They Figured Out That We Later Forgot

The really striking thing, looking back, is how much these early practitioners intuited that modern research has since confirmed. The emphasis on coniferous forests in many of these retreats, for instance, turns out to have a basis in chemistry: pine and fir trees release phytoncides — airborne organic compounds that have been shown to increase natural killer cell activity in the human immune system. Researchers didn't identify this mechanism until the 1980s. But American sanitarium doctors in the 1890s were sending their patients specifically into pine forests and reporting better outcomes.

The collapse of this tradition had several causes. The rise of pharmaceutical medicine after World War II shifted the cultural understanding of healing toward drugs and procedures. The sanitarium model fell out of favor as specific treatments for tuberculosis and other conditions improved. And the whole framework of nature as medicine began to seem vague and unscientific in an era that increasingly valued measurable interventions.

The Quiet Revival

What's happening now is less a discovery than a rediscovery. The research base for nature-based therapies has grown substantially over the past two decades, and practitioners in the US are increasingly formalizing what those Adirondack doctors were doing informally more than a century ago. Forest therapy guide certification programs now exist. Some hospitals are incorporating nature walks into recovery protocols. The language is new — "ecotherapy," "green prescriptions" — but the underlying idea would have been entirely familiar to Dr. Trudeau.

Muir himself, if he were alive today, would probably find the whole conversation a bit obvious. He spent decades trying to convince anyone who would listen that wild nature did something to people that nothing else could replicate. He was right. It just took the rest of us an embarrassingly long time to catch up.

Next time someone tells you forest bathing is a Japanese import, you can gently point out that Americans were out in the pines getting healed well before it had a name.