Why Your Brain
Needs a Garden
August 21, 2014
Story at-a-glance
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Garden use leads to decreased levels of agitation or anxiety
among dementia patients
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Gardening is one of the most potent stress-relieving
activities there is and leads to lower levels of the stress
hormone cortisol than other activities, including reading
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Mycobacterium vaccae, a type of bacteria commonly found in
soil, has been found to “mirror the effect on neurons that
drugs like Prozac provide”
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The microbes help to stimulate serotonin production, helping
to make you feel happier and more relaxed.
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In one animal study, mice that ingested mycobacterium vaccae
had a demonstrated reduction in anxiety and improved
learning
By Dr. Mercola
Mirabel Osler, an English writer and garden designer,
famously said: "There can be no other occupation like
gardening in which, if you were to creep behind someone at their
work, you would find them smiling."
Indeed, gardening, a pastime taken up by 72 percent of US
households,1
awakens a primal urge that many of us have to connect with the
earth. By putting your hands in the soil, you are able to
physically unite with nature on an elemental level.
At the same time, gardening gets you outdoors in the fresh
air and sunshine, helping your body produce much-needed
vitamin D. It gets
you moving, providing important exercise, and allows you to
connect socially with other gardeners.
When you garden, you're adding beauty to the landscape and
habitat for birds, bees, frogs, worms, and so much more.
Depending on what you garden, you can reap a harvest of fruits
and vegetables to feed your family. You can also indirectly feed
your brain for better mood and emotional health, and to satisfy
your curiosity for knowledge.
In fact, learning is the fourth top reason why
people say they garden -- after to grow safe, healthy food, get
exercise, and add beauty to their yard.2
Perhaps it's no coincidence that people garden, in part, to
stimulate their brains, as gardening has been shown to impact
brain health considerably.
Spending Time in a Garden May Help Calm Dementia Patients
A new systematic review examined the impact of gardens and
outdoor spaces on the mental and physical well-being of people
with dementia. The research suggested that garden use, whether
it be watering plants, walking through a garden or sitting in
one, led to decreased levels of agitation or anxiety among the
patients.3
As for why the garden may help induce calm, Dr. Mark Stecker,
chairman of neurosciences at Winthrop-University Hospital, who
was not involved with the study, said:4
"When your brain is impaired, you go back to your
basic instincts. Many people have always enjoyed the
outdoors. They may not have an explicit memory of that, but
it's an implicit memory. And they find it comforting to be
outside."
This makes sense, especially considering researchers in the
Netherlands have found that gardening is one of the most potent
stress-relieving activities there is.5
In their trial, two groups of people were asked to complete a
stressful task; one group was then instructed to garden for half
an hour while the other group was asked to read indoors for the
same length of time.
Afterward, the gardening group reported a greater improvement
in mood. Tests also revealed they had lower levels of the stress
hormone cortisol, compared to those who tried to relax by quiet
reading.
Interestingly, while spending time in a garden may help
relieve some dementia symptoms, it may also help to reduce your
risk of developing dementia in the first place. As reported by
CNN:6
"Two separate studies that followed people in their
60s and 70s for up to 16 years found, respectively, that
those who gardened regularly had a 36 percent and 47 percent
lower risk of dementia than non-gardeners, even when a range
of other health factors were taken into account.
These findings are hardly definitive, but they
suggest that the combination of physical and mental activity
involved in gardening may have a positive influence on the
mind."
Gardening May Make You Happy Via Antidepressant Microbes in the
Soil
According to a survey by Gardeners' World magazine,
80 percent of gardeners reported being "happy" and satisfied
with their lives, compared to 67 percent of non-gardeners.7
Perhaps it's no coincidence that gardeners are happier…
Mycobacterium vaccae is a type of bacteria commonly
found in soil, which people may ingest or inhale when they
garden.8
Remarkably, this microbe has been found to "mirror the effect on
neurons that drugs like Prozac provide."9
It helps to stimulate serotonin production, helping to make you
feel happier and more relaxed. No wonder so many people describe
their garden as their "happy place."
In one animal study, mice that ingested Mycobacterium
vaccae had a demonstrated reduction in anxiety and improved
learning. The researchers noted that natural exposure to
microbes may be important for emotional health and behavior:
10
"Recent studies show that contact with tolerogenic
microbes is important for the proper functioning of
immunoregulatory circuits affecting behavior, emotionality
and health…
Collectively, our results suggest a beneficial effect
of naturally delivered, live M. vaccae on anxiety-related
behaviors… supporting a positive role for ambient microbes
in the immunomodulation of animal behavior."
A Free Way to Drastically Improve the Health of Your Soil
Nurturing the health of your soil may benefit you on
multiple levels, not only by exposure to mood-boosting microbes
but also because healthy soil is what allows your food, the
vegetables and fruits, to grow nutrient-dense foods.
Nature is self-sustaining, and when left alone the ground
will get covered with leaves and organic materials that then
turn into lush compost, adding nutrients back to the soil. This
top layer of organic material also shields the soil and helps
retain moisture.
Imitating nature by covering your garden with wood chips will
result in less watering and improved yield. The most
cost-effective solution is to contact your local tree service,
where you can get large amounts of wood chips (tree branches
that have gone through a wood chipper) for free, rather than
purchasing mulch from a garden center.
It is important to distribute all the chips within 1-2 days
though, otherwise they tend to decompose and you will breathe in
some nasty dust as you move them. You can see my recent article
for more information on
wood chips. Besides wood chips, I strongly encourage you to
consider adding
biochar to your garden, to optimize the health of your soil.
This soil amendment can truly transform your garden, in terms of
dramatically boosting yields.
One of the keys to a truly successful garden is to improve
the microbiology of the soil. It is this diverse collection of
bacteria, fungi, and parasites that actually transfer the
nutrients from the soil into the plant. While synthetic
fertilizers like Miracle Grow will supply some nutrients, these
salts actually kill the soil microbes! As a result, your garden
will not become "self-sustaining" and it will worsen over time.
To thrive and multiply, these soil microbes need a home to
hang out in, or else they simply die shortly after application.
Biochar serves this function perfectly as do wood chips as, over
time, they are converted to carbon stable humates. I've applied
about eight tons of biochar on my property, and I'm now noticing
major improvements. Biochar is not free, but wood chips
typically are. I have applied 30 tons of chips and hope to
double or triple that amount soon. Nitrogen sources like human
urine can be a helpful approach to balance the mixture.
Gardening Helps You Get Grounded
There's another way that gardening may help your mood and
brain health, and that is grounding. As detailed in the
documentary film
Grounded, the surface of the earth holds subtle
health-boosting energy, and all you have to do to harness it is
touch it. Walking barefoot on the earth transfers free
electrons from the earth's surface into your body that then
spread throughout your tissues.
Grounding has been shown to relieve pain, reduce
inflammation, improve sleep, and enhance your well-being. Monty
Don, a TV presenter and garden writer, attributes the wellbeing
of gardeners to the "recharging" you get from sticking your
hands in the soil and spending time outdoors in nature.11
To maximize grounding while you're gardening, try doing so
barefoot.
Are You Ready to Try Out Your Green Thumb?
Aside from increasing your sense of well-being and calm,
keeping a garden can also improve your health by providing you
with fresher, uncontaminated food; nutrient-dense food that is
simply unavailable in your grocery store. It will also help you
reduce your grocery bill. You don't need vast amounts of space
either.
Even apartment dwellers can create a well-stocked edible
garden. You can use virtually every square foot of your space to
grow food, including your lateral space. Hanging baskets are
ideal for a wide variety of crops, such as strawberries, leafy
greens, runner beans, pea shoots, tomatoes, and a variety of
herbs. You can also grow sprouts like sunflower seeds and reap a
harvest in 7-10 days.
And instead of flowers, window boxes can hold herbs, greens,
radishes, scallions, bush beans, strawberries, chard, and
chilies, for example. Just start small, and as you get the hang
of it, add another container of something else. To learn more,
please see my previous article on creating
edible gardens in small spaces. Before you know it, large
portions of your meals could come straight from your own edible
garden. I recommend getting your feet wet by
growing sprouts, which can be grown at any time of year. And
with fall nearly upon us in the US, you can even create a
winter garden.
Copyright 1997- 2014 Dr. Joseph Mercola. All Rights Reserved.
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