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Why A Walk In The Forest Is Great For Your Health

Forest

Have you ever wondered why you feel healthier and happier when you stroll through the trees or frolic by the sea? Is it just that you’re spending time away from work, de-stressing and taking in the view? Or is there more to it? For more than 20 years, scientists have been trying to determine the mechanisms by which exposure to biodiversity improves health.

Japanese scientists pioneered the search when they travelled to the island of Yakushima, famous for its biodiversity. The Japanese already had a name for the experience of well-being in nature: shinrin-yoku or “forest bathing”.

We do know that a diverse ecosystem supports a varied and beneficial microbial community living around and inside us. We also know that exposure to green space, even within urban environments, increases our physical and mental well-being. But what are the mechanisms?

Forest

Forest Air

The forest air

The Japanese researchers suggested that we are taking in beneficial substances when we breathe forest air. Research has identified three major inhaled factors that can make us feel healthier.

These factors are beneficial bacteria, plant-derived essential oils and negatively-charged ions.

From birth to the grave, beneficial bacteria surround us; they live in the environment and, importantly, in the air we breathe. We also share almost our entire body with them.

The more interaction we have with them, the happier and healthier we are. This is in part due to our gut-dwelling bacteria, which break down the food we cannot digest and produce substances that benefit us both physically and mentally.

Plants and the bacteria living on them can produce essential oils to fight off harmful microorganisms. These are referred to collectively as phytoncides, literally, “plant-derived exterminators”.

Research on the health benefits of plant essential oils is in its infancy. But one recent study found that a phytoncide from Korean pine trees improved the health and bacterial make-up of pigs.

Notwithstanding some of the pseudoscience that gets wrapped around negative ion generating machines, there is evidence that negative air ions may influence mental outlook in beneficial ways.

There are relatively higher levels of negative air ions in forested areas and close to bodies of water. This may factor into the benefits of walking in a forest or near the ocean.

But, as the German writer Goethe once said:

“Nature has neither kernel nor shell; she is everything at once.”

Bacteria, essential oils and negative ions interact and influence each other. For example, negative ions and phytoncides may dictate the microbial make-up within a natural environment. There is evidence that this could also be taking place in the human gut.

Forest

Love For Nature

More to be done

Nature-relatedness, or biophilia in which an individual feels connected to nature, has been linked with better health. But we have a long way to go before we can more fully understand the mechanisms by which an innate love of nature can benefit our health.

An important part of this discussion – an overlooked one in our opinion – is further understanding of an individual’s connection to nature.

Psychologists have convincingly demonstrated connections between nature relatedness and mental well-being.

 

 

But how does a greater personal affinity to nature interact with dietary habits, personal microbiome, physical activity levels and many other lifestyle variables that might be intertwined with having such an affinity?

In the meantime, while scientists turn over stones and search for important mechanistic clues – including those related to biodiversity – there are many simple ways to capitalise on our biophilia.

Why not run in the park or by a river instead of on a treadmill, or take a walk through a park on the way to work or at lunchtime?

Critically, there is increasing evidence that we can help shape our children’s mental and physical health by exposing them to more green environments as they work, rest and play.

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