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.
More to be doneNature-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. The US-based Children and Nature Network is a great resource of research news and activities bringing children and nature together.
In the World Health Organization report Connecting Global Priorities – Biodiversity and Human Health, released in December last year, it was concluded that: " Considering ‘microbial diversity’ as an ecosystem service provider may contribute to bridging the chasm between ecology and medicine/immunology [… ] the relationships our individual bodies have with our microbiomes are a microcosm for the vital relationships our species shares with countless other organisms with which we share the planet."
It is easy to see that discussions of natural environments and human health are no mere matter of intellectual fancy.
In a paper published in December 2015 in Journal of Physiological Anthropology, we’ve called for more research into the links between biodiversity and human physical and mental well-being, particular in relation to childhood, that most formative of times.
Wouldn’t it be good if by nurturing our environment we were also nurturing our children’s future health?
Bushwalk
