Forest Bathing: The Health Practice I Was Doing Without Knowing It

For the last several years I have spent two to three hours at a time walking through the forest at Oaks Bottom Wildlife Refuge with my camera, about five days a week.

What began as a passion for wildlife photography has become something deeper. It has become one of the most important health practices of my entire life.

I did not know there was a name for what I was doing. It turns out the Japanese have been studying it for decades, and they call it shinrin-yoku, which translates simply as forest bathing.

What Forest Bathing Actually Is

It does not mean swimming in the woods. It means slowly and deliberately immersing yourself in a forest. No phone. No rushing. No destination. Just being there among the trees and letting nature do what it has always done for people.

Japan began formally researching this in the 1980s, after noticing something odd: people who spent regular time among trees were healthier than people who did not. Lower blood pressure. Reduced stress hormones. Stronger immune markers. Better mood.

Scientists wanted to know why. What they found is genuinely strange.

The Chemistry Trees Put Into the Air

Trees are not passive. They are actively defending themselves, and they do it partly by releasing airborne chemical compounds called phytoncides.

Phytoncides are essentially part of a tree’s immune system. Under attack from insects, fungi or bacteria, a tree releases these aromatic compounds into the surrounding air as a defense. They are the reason a conifer forest smells the way it does — that sharp resinous note is the tree at work.

Which means when you walk through a forest, you are breathing in the trees’ immune system.

And that is where it gets interesting for us. Inhaling phytoncides has been associated with:

• Increased natural killer cell activity — the immune cells that deal with virus-infected and tumor cells
• Measurably lower cortisol
• Lower blood pressure and heart rate
• Reduced inflammatory markers
• Improved mood scores

The study everyone quotes is Qing Li’s work in Japan, which found that a weekend forest trip raised natural killer cell activity by roughly 50 percent, and that the effect was still measurable thirty days later.

One weekend. A month of elevated immune activity. From breathing forest air.

I want to be straight about the evidence, because I would rather you trusted me than be impressed by me. Those immune studies are small — a dozen or so participants each. They have been repeated with similar results, and the cortisol and blood pressure findings rest on a much broader base of research. But a dozen people is a dozen people, and anyone telling you this is settled beyond question is overselling it.

It is promising, it is plausible, and the downside risk of walking in the woods is essentially zero.

And Honestly, It Is Not Only the Trees

Here is the part most forest bathing articles leave out, and I think leaving it out does the idea a disservice.

When I walk Oaks Bottom for two or three hours, several separate things are happening at once, and the phytoncides are only one of them.

I am walking for two or three hours. That alone is a serious dose of low-intensity movement, and it would improve almost anybody’s health markers whether there were trees involved or not. It is genuinely difficult for researchers to separate the tree effect from the walking effect, and honest ones say so.

I am outside in morning daylight. This one is underrated and the science behind it is strong. Bright morning light is the most powerful signal your circadian clock receives. Get it early and consistently and your sleep that night is better — and sleep is upstream of nearly everything else. Two hours of outdoor morning light is a bigger intervention than most supplements.

I am completely absorbed in something. More on that below, but sustained attention on something outside yourself is doing real work.

I do not think any of this weakens the case. I think it strengthens it. Forest bathing is not one magic mechanism. It is four or five good things stacked on top of each other, which is exactly why it works better than any single thing you could buy.

Two Different Forests

The photograph at the top of this post is not Oaks Bottom. It is H.B. Van Duzer Forest State Scenic Corridor, out along the highway toward the coast, and the difference between the two places turns out to matter.

Van Duzer is coastal conifer forest — Douglas fir and hemlock, deep moss, fallen logs going soft, light coming down in shafts. Conifers are the heavy phytoncide producers. Those resinous compounds are largely a conifer specialty, which is why a fir forest smells so much more strongly than a stand of maples, and why most of the Japanese research was done in cedar and cypress. If you want the strongest dose, that is the kind of forest to find.

Oaks Bottom is a different animal. It is bottomland — black cottonwood, Oregon ash, big-leaf maple, Oregon white oak, wetland and meadow, a hundred and sixty acres of it inside the city limits. Less resin in the air. But it is ten minutes from my house, and I can be in it most mornings.

That is the trade, and I think consistency wins it easily. The best forest for your health is not the most pharmacologically potent one. It is the one close enough that you actually go.

What the Refuge Has Given Me

I walk into Oaks Bottom most mornings with my camera. I am there to photograph birds and the extraordinary ordinary beauty of the place. What I have come to understand is that the forest is working on me at the same time.

My lungs are taking in whatever the trees are putting out. My nervous system is settling. My cortisol is dropping without my doing anything except being there.

This is not mystical thinking. It is measurable.

And yet it also feels like more than that. There is something about standing quietly among trees that were here long before you that puts the urgency of modern life in proportion. The forest predates our problems and it will outlast them.

There is a practical outcome too, which I did not plan. All those mornings turned into a body of work. The birds I kept finding became the Portland Field Guide — species, seasons, where to look. The health practice and the work turned out to be the same activity.

Wildlife Photography As Moving Meditation

There is another dimension to this that I think multiplies everything above.

Wildlife photography requires total present-moment awareness.

You cannot photograph a great blue heron while thinking about your bills. You cannot catch a deer moving through morning light while mentally rehearsing an argument. The animal will be gone before your mind gets back.

It trains you to be completely here. Watching. Listening. Breathing. Waiting.

And the waiting is the whole thing. It is always a contest over who has more patience, and the honest answer is that the bird has more. I once stood on a riverbank for an hour waiting for an osprey to dive. A great blue heron can stand motionless in cold water longer than most people will stand anywhere. Usually they win. Usually I am the one who gives up and walks back to the car.

Which is also why I go alone. Bring somebody along and there is a schedule in the conversation — something to get back to, somewhere to be at three. The moment a schedule exists, the hour of standing still becomes impossible.

And the hour of standing still is the entire medicine.

This is meditation in its oldest form. Human beings spent hundreds of thousands of years in exactly this state — alert, quiet, attentive, outdoors. Our nervous systems were built in that condition. When I am out there with the camera I am not only making photographs. I am doing what people did for most of our history.

The camera gives me a reason to be still. The forest gives me everything else.

You Need Far Less Than This

You do not need a wildlife refuge, an expensive camera, or three hours. I do two or three hours, five days a week, because it is also my work. Nobody should read this as the minimum dose.

The research is encouraging about small amounts. Around twenty to thirty minutes in nature appears to give the largest cortisol drop per minute spent — after that you keep gaining, but more slowly. A city park with mature trees counts. So does a single street with big conifers on it.

Even a view counts. A classic hospital study found that surgical patients whose window faced trees recovered faster and needed less pain medication than patients facing a brick wall. Same surgery, same ward, different window.

If you cannot get to a forest, build a small one where you live. A pot on a balcony and a dish of water will bring you more than you expect.

An Invitation

If you have never walked slowly through a forest with no goal except to be in it, try it this week.

Leave the phone in your pocket, or better, in the car. Walk slowly. Breathe deeply. Look up at the canopy. Listen to what is moving in the leaves. Notice how the light comes down through the branches.

Do not photograph it. Do not post it. Just stand there for a while and let the place get on with what it is doing.

The forest has been offering this for as long as there have been forests.

We simply forgot to accept it.