Could Forest Bathing Be One of Public Health's Most Overlooked Tools?

Scientists are discovering that spending time in forests may help prevent disease before treatment is ever needed…

Image by Stephen Cruickshank from Pixabay

Nature is powerful medicine. Multiple studies over the years have found that people in hospitals with windows overlooking nature recover and heal faster than those without. And I remember the years when Louise and I ran a community for abused kids that was out in the woods of rural New England, it always seemed that taking them on nature walks calmed them down more than anything else, including most of the meds.

Last month, a team of researchers from six countries published an argument in Communications Health that nature should be thought of as a therapeutic tool in and of itself, and should be available to everybody. They point out that worldwide anxiety is up 63 percent and depression up 26 percent just over the past 15 years, and argue that much of this is the result of what they call “nature deprivation.”

The solution, they recommend is something called “nature-based mental healthcare” or NBMHC, citing multiple studies showing the power of regular immersion in nature as a psychological tool every bit as important and effective (and sometimes more so) as pharmaceuticals.

Ralf Buckley, the lead author, points out that more than half of all doctor visits these days are now about some aspect of mental rather than physical health, but mental health gets roughly half of one percent of public health funding.

— A 2007 study found that “forest bathing” — a Japanese concept that’s taken hold around the world, basically standing in the forest and pausing to take it all in — measurably reduces levels of cortisol, the “stress hormone.”

— A 2010 study discovered that the anti-cancer immune system “killer cells” (NK cells) in our bloodstream jacked up by exposure to nature:

“…2-night/3-day trips to forest parks enhanced human NK activity, the number of NK cells, and intracellular anti-cancer proteins in lymphocytes, and that this increased NK activity lasted for more than 7 days after the trip in both male and female subjects.”

Follow-up research found that even a one-day trip to the forest similarly increased killer cell activity, helping prevent cancer in people for at least a week thereafter.

I’ve been drawn to nature my entire life, from exploring forests and a nearby stream as a kid to Louise and my weekend trips to Portland’s Forest Park to climb the foothills of the Tualatin mountains.

And it’s not just the physical activity; when “forest bathing” is compared to working out in a gym both produce physical improvements, but the psychologically positive effects of forest bathing far outstrip those of simple exercise.

Louise and I, however, live in a city with the largest urban park in the world with over 80 miles of trails in it. And we have a good enough income to afford a car to drive to it, something many people simply can’t do.

Pointing specifically to this imbalance in access to nature caused by financial status, the authors of that first study I mentioned argue that nations should start thinking of natural spaces as part of the panoply of psychotherapeutic tools available to society, rather than decorations or recreational opportunities for people who can afford to get to them (or pay for a park pass, like in many parts of America; here in Portland, Forest Park is free).

I wrote a while back about awe being the cheapest medicine we’ve got, but cheap isn’t the same thing as accessible. In the medical context, we spend a fortune on both physical and psychological tools to repair people, but nature is almost never (other than the hospital windows studies and changes in new hospital construction) considered as a therapy.

Buckley’s team calculated back in 2019 that national parks contribute upwards of five trillion dollars a year to the global economy through the mental health benefits to visitors alone; that’s roughly five hundred times what the world spends maintaining protected areas that, it turns out, can be so critical to improving mental health (with considerable side-benefits for physical health).

Nature, it turns out, is the cheapest, safest, best-tolerated intervention in the entire mental health toolkit, but has been quietly reclassified as, essentially, a consumer good, now only available to people who have a car, a weekend, and enough disposable income.

Teddy Roosevelt understood the importance of wilderness areas instinctively and intuitively, having used nature for years to treat his own asthma and “weak constitution.” It’s why he set aside over 230 million acres of wilderness as national parks, land that sadly today’s administration is trying to sell off to donor drilling and mining operations as fast as it can.

China, on the other hand, having examined this type of research and drawing on centuries of folk medicine pointing in the same direction, has, according to researchers, a “national health strategy includes nature-therapy infrastructure in 1200 forest reserves, to provide a billion person-hours per year.”

Nature should be available to everybody, and our urban planning and policies should make sure that we have wild spaces and public transportation cheap enough to get pretty much everybody to the wild spaces.

Let your state legislators and city council know, and put together a plan to get yourself into nature at least once a week!