Reduce Risk of Cancer And Mental Health Disorder With This

May 09, 2023; Unhurry Expert Research Team

After a randomized, controlled trial of community gardening, University of Colorado at Boulder, found that those who started gardening ate more fibre and got more physical activity — two known ways to reduce risk of cancer and chronic diseases.

They also saw their levels of stress and anxiety significantly decrease.

Gardening positively impacts physical and mental health

The study which was funded by the American Cancer Society was published the journal Lancet Planetary Health.

“These findings provide concrete evidence that community gardening could play an important role in preventing cancer, chronic diseases and mental health disorders,” said senior author Jill Litt, a professor in the Department of Environmental Studies at CU Boulder.

How gardening can help reduce risk of cancer?

Litt has spent much of her career seeking to identify affordable, scalable, and sustainable ways to reduce disease risk, especially among low-income communities.

Gardening seemed an ideal place to start.

“No matter where you go, people say there’s just something about gardening that makes them feel better,” said Litt, who is also a researcher with the Barcelona Institute for Global Health.

Garden your way to health

Some small observational studies have found that people who garden tend to eat more fruits and vegetables and have a healthier weight.

But it has been unclear whether healthier people just tend to garden, or gardening influences health.

Further, only three studies have applied the gold standard of scientific research, the randomized controlled trial, to the pastime.

None have looked specifically at community gardening.

Gardening an effective cancer therapy

For the study, Litt recruited 291 non-gardening adults, average age of 41, from the Denver area.

More than a third were Hispanic and more than half came from low-income households.

After the last spring frost, half were assigned to the community gardening group and half to a control group that was asked to wait one year to start gardening.

The gardening group received a free community garden plot, some seeds and seedlings, and an introductory gardening course through the non-profit Denver Urban Gardens program and a study partner.

Both groups took periodic surveys about their nutritional intake and mental health, underwent body measurements, and wore activity monitors.

A fibre boost through gardening

By fall, those in the gardening group were eating, on average, 1.4 grams more fibre per day than the control group — an increase of about 7%.

The authors note that fibre exerts a profound effect on inflammatory and immune responses, influencing everything from how we metabolize food to how healthy our gut microbiome is to how susceptible we are to diabetes and certain cancers.

While doctors recommend about 25 to 38 grams of fibre per day, the average adult consumes less than 16 grams.

“An increase of one gram of fibre can have large, positive effects on health,” said co-author James Hebert, director of University of South Carolina’s cancer prevention and control program.

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Increased physical activity because of gardening

The gardening group also increased their physical activity levels by about 42 minutes per week.

In the US, Public health agencies recommend at least 150 minutes of physical activity per week, a recommendation only a quarter of the population meets.

With just two to three visits to the community garden weekly, participants met 28% of that requirement.

Additionally, study participants also saw their stress and anxiety levels decrease, with those who came into the study most stressed and anxious seeing the greatest reduction in mental health issues.

The study also confirmed that even novice gardeners can reap measurable health benefits of the pastime in their first season.

As they have more experience and enjoy greater yields, Litt suspects such benefits will increase.

Healthy relationships through gardening

The study results don’t surprise Linda Appel Lipsius, executive director of Denver Urban Gardens (DUG), a 43-year-old non-profit that helps about 18,000 people each year grow their own food in community garden plots.

“It’s transformational, even lifesaving, for so many people,” Lipsius said.

Many DUG participants live in areas where access to affordable fresh fruits and vegetables is otherwise extremely limited.

Some are low-income immigrants now living in apartments — having a garden plot allows them to grow food from their home country and pass on traditional recipes to their family and neighbours.

Social structure and mental health

“Even if you come to the garden looking to grow your food on your own in a quiet place, you start to look at your neighbour’s plot and share techniques and recipes, and over time relationships bloom,” said Litt, noting that while gardening alone is good for you, gardening in community may have additional benefits.

“It’s not just about the fruits and vegetables. It’s also about being in a natural space outdoors together with others.”

Gardening works in preventing cancer

Litt said she hopes the findings will encourage health professionals, policymakers, and land planners to look to community gardens, and other spaces that encourage people to come together in nature, as a vital part of the public health system.

The evidence is clear, she said.

Researchers from the Colorado School of Public Health, Colorado State University and Michigan State University also contributed to this study.

Story Source:

Materials provided by University of Colorado at Boulder. Original written by Lisa Marshall. Note: Content may be edited for style and length.

Journal Reference:

Jill S Litt, Katherine Alaimo, Kylie K Harrall, Richard F Hamman, James R Hébert, Thomas G Hurley, Jenn A Leiferman, Kaigang Li, Angel Villalobos, Eva Coringrato, Jimikaye Beck Courtney, Maya Payton, Deborah H Glueck. Effects of a community gardening intervention on diet, physical activity, and anthropometry outcomes in the USA (CAPS): an observer-blind, randomised controlled trial. The Lancet Planetary Health, 2023; 7 (1): e23 DOI: 10.1016/S2542-5196(22)00303-5

Page citation

University of Colorado at Boulder. “Study shows gardening may help reduce cancer risk, boost mental health.” ScienceDaily. ScienceDaily, 6 January 2023. <>.

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