Will two hours in the park be the next 10,000 steps?
As people spend an unprecedented amount of time indoors, a mountain of scientific research shows spending time in nature is critical to health and increases longevity. That means being in fresh air, under trees and away from cars, wifi and concrete—on a regular basis. And, no, the Peloton doesn’t count.
“There’s an urgent need emerging in science, and at the gut level to increase the nature experience. This field is just exploding!” says Gretchen, a professor of environmental science at Stanford.
The benefits have been clear to scientists for some time. But the pandemic has made the matter much more urgent. The physical and emotional cost the virus has taken, especially in urban areas with less green space, has galvanized doctors, researchers and others to tap into mother nature’s therapeutic effects.
Spending time in the wild—a practice the Japanese call "forest bathing"— is strongly linked to lower blood pressure, heart rate and stress hormones and decreased anxiety, depression and fatigue.
Scientists have constantly found that human anticancer natural killer cells significantly increase after walks in a forest. In one such study, published in 2010 in the Journal of Biological Regulators and Homeostatic Agents, the number and activity of killer cells increased in a group of twelve healthy men after two walks, each two hours long, in a one-day trip to a forest park in the Tokyo suburbs. So did anti-cancer proteins, according to the research led by Qing Li, an associate professor at the Nippon Medical School. Cortisol in the blood and adrenaline in the urine significantly decreased. The effects lasted at least seven days, the researchers found.
Time in a forest is linked to decreased inflammation, which has been implicated in chronic disease.
“People are deciding whether or not this type of coffee bean or that type is better for you, when there is such an obvious health tool at your disposal. You literally just walk outside. People don’t know,” says Jared Hanley, co-founder and CEO of NatureQuant, a startup working on an app for users to track the time they spend in nature much like they count steps.
A study published in Nature’s Scientific Reports
in 2019 found the 20,000 participants were significantly more likely to report good health and well-being when they spent 120 minutes or more in nature a week. The good vibe peaked at 200 to 300 minutes a week. Anything less than two hours didn’t make a difference.