While mental health experts warn about depression as a global epidemic, other researchers are discovering ways we trigger our natural production of happy chemicals that keep depression at bay, with surprising results. All you need to do is get your fingers dirty and harvest your own food.
In recent years I’ve come across two completely independent bits of research that identified key environmental triggers for two important chemicals that boost our immune system and keep us happy – serotonin and dopamine. What fascinated me as a permaculturist and gardener were that the environmental triggers happen in the garden when you handle the soil and harvest your crops.
Getting down and dirty is the best ‘upper’ – Serotonin
Getting your hands dirty in the garden can increase your serotonin levels – contact with soil and a specific soil bacteria, Mycobacterium vaccae, triggers the release of serotonin in our brain according to research. Serotonin is a happy chemical, a natural anti-depressant and strengthens the immune system. Lack of serotonin in the brain causes depression.
Ironically, in the face of our hyper-hygienic, germicidal, protective clothing, obsessive health-and-safety society, there’s been a lot of interesting research emerging in recent years regarding how good dirt is for us, and dirt-deficiency in childhood is implicated in contributing to quite a spectrum of illnesses including allergies, asthma and mental disorders.
At least now I have a new insight into why I compulsively garden without gloves and have always loved the feeling of getting my bare hands into the dirt and compost heap.
Harvest ‘High’ – Dopamine
Another interesting bit of research relates to the release of dopamine in the brain when we harvest products from the garden. The researchers hypothesise that this response evolved over nearly 200,000 years of hunter gathering, that when food was found (gathered or hunted) a flush of dopamine released in the reward centre of brain triggered a state of bliss or mild euphoria. The dopamine release can be triggered by sight (seeing a fruit or berry) and smell as well as by the action of actually plucking the fruit.
The contemporary transference of this brain function and dopamine high has now been recognised as the biological process at play in consumers addiction or compulsive shopping disorder. Of course the big retail corporations are using the findings to increase sales by provoking dopamine triggers in their environments and advertising.
I have often remarked on the great joy I feel when I forage in the garden, especially when I discover and harvest the ‘first of the season’, the first luscious strawberry to ripen or emergence of the first tender asparagus shoot. (and yes, the photo is my hand plucking a deliciously sweet strawberry in my garden) I have also often wondered why I had a degree of inherent immunity to the retail-therapy urges that afflict some of my friends and acquaintances. Maybe as a long-term gardener I’ve been getting a constant base-load dopamine high which has reduced the need to seek other ways to appease this primal instinct. Though, I must admit with the benefit of hindsight, I now have another perspective on my occasional ‘shopping sprees’ at local markets buying plants for the garden.
Of course dopamine responses are triggered by many other things and is linked with addictive and impulsive behaviour. I suppose the trick is to rewire our brains to crave the dopamine hit from the garden and other more sustainable pursuits and activities. As a comment on PlanetDrum stated, “all addiction pathways are the same no matter what the chemical. As long as you feel rewarded you reinforce the behavior to get the reward.”
So in other words it all comes down to the fact that we can’t change our craving nature but we CAN change the nature of what we crave.
Strengthening the Case for Organic
Glyphosate residues deplete your Serotonin and Dopamine levels
Of course, for all of the above to work effectively and maintain those happy levels of serotonin and dopamine, there’s another prerequisite according to another interesting bit of research I found. It appears it will all work much better with organic soil and crops that haven’t been contaminated with Roundup or Glyphosate-based herbicides. This proviso also extends to what you eat, so ideally you’ll avoid consuming non-organic foods that have been grown in farmland using glyphosates.
A recent study in 2008 discovered that glyphosate, the active ingredient of Roundup, depletes serotonin and dopamine levels in mammals. Contrary to Monsanto claims, glyphosate and other Roundup ingredients do perpetuate in the environment, in soil, water, plants and in the cells and organs of animals. One study found glyphosate residues in cotton fabric made from Roundup-ready GM cotton can absorb into the skin and into our nervous and circulatory systems.
No wonder there’s so much depression around, and stress, and all the addictions and compulsive disorders in the pursuit of feeling good. I think back on when I moved to Sydney in 1984 for a few years and was contacting community centres in the inner west to see if there was interest in permaculture or gardening classes. A very terse social worker snapped at me “listen dear, we don’t need gardening classes, we need stress therapy classes”, and promptly hung up on me with a resounding “Huh!” when I replied that gardening was the best stress therapy I knew.
So enjoy the garden, fresh organic food and make sure you have fun playing in the dirt on a regular basis.
Robyn Francis 2010
Robyn Francis is an international permaculture designer, educator, writer and pioneer based at Djanbung Gardens, Nimbin Northern NSW. She is principal of Permaculture College Australia.
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Here’s some interesting sites and extracts for further info and reading
Glyphosate Report PDF
fhrfarms1.com/docs/…/Gly%20monograph%20PANAP%204-10.pdf An in-depth and comprehensive report of independent research on impacts and effects of Glyphosate and Roundup published by Pesticide Action Network Asia and the Pacific, Nov 2009
Soil Bacteria Work In Similar Way To Antidepressants
UK scientists suggest that a type of friendly bacteria found in soil may affect the brain in a similar way to antidepressants. Their findings are published in the early online edition of the journal Neuroscience.
Soil bacteria can boost immune system
Harmless bug works as well as antidepressant drugs, study suggests
EXTRACT: Exposure to friendly soil bacteria could improve mood by boosting the immune system just as effectively as antidepressant drugs, a new study suggests.
The researchers suspect, however, that the microbes are affecting the brain indirectly by causing immune cells to release chemicals called cytokines. “We know that some of these cytokines can activate the nerves that relay signals from the body to the brain,” Lowry said in a telephone interview.
The stimulated nerves cause certain neurons in the brain to release a chemical called serotonin into the prefrontal cortex, an area of the brain known to be involved in mood regulation, among other things.
Scientists think the lack of serotonin in the brain is thought to cause depression in people.
Previous studies have linked early childhood exposure to bacteria to protection against allergies and asthma in adulthood. The new finding take this idea, called the “hygiene hypothesis,” a step further, and suggests bacteria-exposure not only boosts our immune systems, but alters our vulnerability to conditions such as depression as well.
“These studies help us understand how the body communicates with the brain and why a healthy immune system is important for maintaining mental health,” Lowry said. “They also leave us wondering if we shouldn’t all be spending more time playing in the dirt.”
“Selfish behaviors are reward driven and innate, wired deeply into the survival mechanisms of the primitive brain, and when consistently reinforced, they will run away to greed, with its associated craving for money, food, or power. On the other hand, the self restraint and the empathy for others that are so important in fostering physical and mental health are learned behaviors – largely functions of the new human cortex and thus culturally dependent. These social behaviors are fragile and learned by imitations much as we learn language”. Dr. Peter Whybrow – “American Mania”
Some interesting insights and food for thought…
Status and Curiosity – On the Origins of Oil Addiction by Nate Hagens
The various layers and mechanisms of our brain were built on top of each other, via millions and millions of iterations, keeping intact what ‘worked’ and adding on what changes and mutations helped the pre-human, pre-mammal organism incrementally advance. … We are, all of us, descended from the best of the best at surviving and procreating, which in the environment of privation and danger where we endured the most ‘iterations’ of our evolution, meant acquiring necessary resources, achieving status, and possessing brains finely tuned to natural dangers and opportunities. In our modern environment, it is the combination of pursuit of social status and the plethora of fun, exciting/novel activities that underlies our large appetite for oil.
research tells us that drugs of abuse activate the brain’s mesolimbic dopamine reward system, the neural network that regulates our ability to feel pleasure and be motivated for “more”. When we have a great experience… our brain experiences a surge in the level of the neurotransmitter dopamine. We feel positively charged, warm, ‘in the zone’ and happy. After a while, the dopamine gets flushed out of our system and returns to it’s baseline level. We go about our lives, looking forward to the next pleasurable experience.
Hagens also muses that “There is anecdotal evidence that the typical american diet high in processed starches and sugar robs us of our baseline serotonin – the zen master of brain neurotransmitters. Lack of serotonin makes us more susceptible to cravings/behavioural changes and throws the reward machinery out of whack. Food we buy/eat is available at stores and restaurants because a)it is profitable b)it is convenient and c)it tastes good. I suspect that future changes in diet towards more vegetables and less processed food might improve our collective addictions/impulsivity.
Enjoyed this? Check out these other articles by Robyn Francis…
Learning from Cuba’s Footprint
A Taste of the Bush in the Backyard
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