One more reason to play in the dirt: It makes us happier

Scientists say a bacteria found in dirt boosts serotonin levels, making you feel relaxed and happy.

Don’t be afraid of dirt.

When I was growing up, society wasn’t as obsessed with cleanliness as it is today. Nobody wants to get their hands dirty anymore. Rubber gloves and hand sanitizers are standard fare everywhere you go. God forbid that we might come into contact with germs.

The problem with this strategy is that all of this over-sanitizing is actually making us more sensitive to pathogens. One of the simplest solutions is to get some dirt on our hands or even in our mouths. Dirt is actually good for us.

Here are a few interesting facts about dirt:

■ One tablespoon of soil contains more organisms than there are people on Earth. (Think about that the next time you stick your hands in the soil.)

■ It takes 500 years for Mother Nature to form 1 inch of topsoil. (A good gardener can do it much faster.)

■ There are 5,000 different types of bacteria living in 1 gram of soil — and most are beneficial.

■ One earthworm can process 15 tons of soil per acre in one year. There are about 1.4 million earthworms in an acre of soil.

The take-home message here is that there is a lot of stuff in dirt that we don’t see, and chances are that a good portion of it is beneficial. Unfortunately, as society has advanced, our connection with the dirt has shrunk to a point that humans now have minimal interaction with it.

As a consequence, it is creating problems for us. Incidents of asthma, digestive disorders, allergies and autoimmune issues (especially in children) are all on the rise. Solutions may be as simple as letting our kids get dirty again. Exposure to a wide variety of organisms is what causes us to build up our resistance and immunities. By getting dirty, we are actually strengthening our immune system.

Mary Ruebush, the author of “Why Dirt Is Good,” correctly points out that bacteria are everywhere: on us, in us and all around us. Most of these micro-organisms cause no problem, and many, like the ones that normally live in the digestive tract and produce life-sustaining nutrients, are essential to good health.

“The typical human probably harbors some 90 trillion microbes,” she writes. “The very fact that you have so many microbes of so many different kinds is what keeps you healthy most of the time.”

Studies done at the University of Iowa indicate that even intestinal worms can play a part in regulating the immune system. Another study published in 2012 showed that Amish children who lived on farms had a 50 percent reduction in asthma, allergies and gut-related disorders compared to children who grew up in more sterile environments. This is known as “The Farm Effect.”

What I find to be the most amazing discovery is that dirt can actually make us happier — and not just because we are playing outside in the sunshine and away from our electronic devices.

Dirt contains a bacterium called Mycobacterium vaccae that is being heralded as the new Prozac. It is thought that Mycobacterium vaccae works by stimulating serotonin production, which makes you feel relaxed and happy. Other studies have also shown that this bacterium improves cognitive functions and might be helpful in treating cancer and other diseases.

While it should be no surprise that getting outdoors and playing in the garden will make us happier and healthier, now we also know that part of the reason for this is the dirt that we breathe, touch and sometimes even ingest.

Steve Smith is the owner of Sunnyside Nursery in Marysville and can be reached at

Egg hunt

Sunnyside Nursery will host an Easter egg hunt from 10 a.m. to 3 p.m. at the garden center, 3915 Sunnyside Blvd., Marysville. Eggs are filled with candy, coupons and other prizes. No registration required. For more information, go to

Talk to us

More in Life

Jeff Daniels
Actor Jeff Daniels also knows his way around the blues guitar

The Edmonds Center for the Arts will present a streaming concert by Daniels on Jan. 15.

Freezer-to-table recipes — plus a little help from the kids — makes putting dinner on the table easy. (Jennifer Bardsley)
When families cook together, dinner is ready in a flash

Here’s how you, too, can assemble 14 freezer-to-table recipes in four hours for two weeks of easy meals.

Dr. Paul on making a habit of expressing your appreciation

It can be as easy as putting a sticky note out to remind yourself be on the lookout for a job well done.

Artists Amber and Alex Vincini sit by examples of their artwork outside their studio on Wednesday, Jan. 13, 2020 in Everett, Washington.  (Andy Bronson / The Herald)
CARES Act grant helps artists be creative — and pay the rent

The money allows Everett’s Schack Art Center to hire artists and art educators.

When harvesting an Asian pear, the best method is to taste. Asian pears will ripen on the tree. (Getty Images)
Fruit trees 101: A gardener’s CliffsNotes for growing them

If you have any interest in growing your own fruit, it’s prime time to pick up apples, plums, cherries and pears.

Scherenschnitte is a special type of German paper cutting art, and old and new examples are both seen at auctions. This modern example sold for just $40. (Cowles Syndicate Inc.)
G.B. French made this scherenschnitte in the 20th century

The Kovels were surprised French’s paper cutting art was at auction, when artwork from the 1800s is more popular.

"Diane" witch hazel produces dark copper-red flowers in winter, providing quite a show against its bare branches. (Richie Steffen)
Great Plant Pick: Hamamelis x intermedia ‘Diane,’ Diane witch hazel

“Diane” witch hazel produces dark copper-red flowers in winter, providing quite a show against its bare branches.

Shylah Hallam-Noel left, a worker at Queen Anne Healthcare, a skilled nursing and rehabilitation facility in Seattle, receives the second shot of the Pfizer vaccination for COVID-19, Friday, Jan. 8, 2021, from a Walgreens Pharmacist, right. The facility had an outbreak of COVID-19 in May of 2020 that resulted in more than 100 positive cases among staff and residents, including Allen, and the deaths of 20 residents and two staff members. (AP Photo/Ted S. Warren)
The tricky road to herd immunity, explained

Three researchers who study the spread of infectious disease offer a reality check on how far we’ve come — and how far we have to go.

Photo by Wes Anthony/Firehouse Creative
Lead actress Shannyn Sossamon talks with filmmakers Andrew Morehouse,center, and Nate
Bell while filming “The Hour After Westerly” at the Fort Casey Inn.
Watch film featuring Whidbey Island for free through Jan. 16

The “Twilight Zone”-esque “The Hour After Westerly” is based on a short story by Robert M. Coates.

Most Read