Gardeners have been knowing for centuries that their pastime gives them joy and peace. Many people will say that gardening is stress therapy. There is even a group called the American Horticultural Therapy Association “committed to promoting and developing the practice of horticultural therapy as a unique and dynamic human service modality.”
As with so many things, science introduces us to the physical wonders behind what we already know on a subliminal level. There are two interesting pieces of research that give credence to the feeling that our bodies and souls are better off from gardening.
Researchers reported in the journal Neuroscience that contact with a soil bacteria called Mycobacterium vaccae triggers the release of serotonin in the brain. This type of serotonin acts on several different pathways including mood and learning. Lack of serotonin in the brains is related to depression.
So basically, the things we do as gardeners—working the soil, planting, mulching, and so forth—can really contribute to happiness. We ingest the bacteria by breathing or through broken skin. The simple act of children playing outside in the grass and dirt can be a natural way for them to reduce anxiety.
In addition to increasing happiness and reducing anxiety, serotonin has positive effects on memory and learning. Research presented at the American Society for Microbiology shows that feeding live M. vaccae bacteria to mice significantly improved their ability to navigate mazes, due to the fact that the bacteria triggers the release of brain serotonin. It appears that this bacterium plays a role in learning in mammals.
Have you noticed that you feel really happy when picking those ripe vegetables, especially that first tomato of the season? Well, it turns out that harvesting fruits and vegetables triggers the release of dopamine in the brain. It is speculated that this evolved over 200,000 years of humans harvesting food as hunter-gatherers. Dopamine is strongly correlated with reward-motivated behavior.
So there we have it, two physical reasons why people can be happier and smarter through gardening. I suspect there are several other other reasons contributing to this, including the myriad of colors in plants and animals, trees swaying in the wind, birds singing, squirrels chattering, lady beetles, and fresh air. Perhaps one day we’ll have scientific explanations for all this, but in the meantime we can take comfort in our innate feelings.
By Justin Gardener, REALfarmacy.com
American Society for Microbiology. “Can bacteria make you smarter?.” ScienceDaily, 25 May 2010. Web. 20 Jul. 2013.
According to a recent study published online in the British Journal of Sports Medicine, active hobbies like yard work and gardening were as good as going to the gym for heart health. Older adults with hobbies like this were able to cut their risk of heart attack or stroke and their chances of dying by 30%.
For the study, researchers monitored the health of about 4,000 60-year old adults for 12.5 years. During this time, they underwent an initial health screening which included questions about their diet, smoking, alcohol, and activity habits. Various tests and exams analyzed their heart health, blood sugar,and more.
From the beginning, those who reported being the most active were less likely to have heart problems, no matter how much they “exercised” formally. These elders had smaller waists, lower blood sugar levels, lower clotting factors, and lower levels of blood lipids. The same was true for people who did a lot
What does this mean? It means if you are an older adult, 2 hours of yard work may suffice instead of 60 minutes of a cardio DVD. It means you don’t have to put a title on your fitness, as long as you are staying active. Sure, if you don’t have a garden or a yard to care for, you might want to go with formal exercise, but if you are able to sustain high activity levels without a gym membership, more power to you.