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  APRIL 9, 2019 by APRIL McCARTHY
Nature Pills Heal Stress In 20 Minutes


Taking at least twenty minutes out of your day to stroll or sit in a place that makes you feel in contact with nature will significantly lower your stress hormone levels. That's the finding of a study that has established for the first time the most effective dose of an urban nature experience.


Healthcare practitioners can use this discovery, published in Frontiers in Psychology, to prescribe ‘nature-pills' in the knowledge that they have a real measurable effect.

There are many ways to connect with ourselves and others, but nature is certainly one of the best ways.

"Nature is fuel for the soul," says Richard Ryan, lead author and a professor of psychology at the University of Rochester. "Often when we feel depleted we reach for a cup of coffee, but research suggests a better way to get energized is to connect with nature," he says.

"We know that spending time in nature reduces stress, but until now it was unclear how much is enough, how often to do it, or even what kind of nature experience will benefit us," says Dr. MaryCarol Hunter, an Associate Professor at the University of Michigan and lead author of this research. "Our study shows that for the greatest payoff, in terms of efficiently lowering levels of the stress hormone cortisol, you should spend 20 to 30 minutes sitting or walking in a place that provides you with a sense of nature."

Free and Natural Stress-Relieving Remedy

Nature pills could be a low-cost solution to reduce the negative health impacts stemming from growing urbanization and indoor lifestyles dominated by screen viewing. To assist healthcare practitioners looking for evidence-based guidelines on what exactly to dispense, Hunter and her colleagues designed an experiment that would give a realistic estimate of an effective dose.

Over an 8-week period, participants were asked to take a nature pill with a duration of 10 minutes or more, at least 3 times a week. Levels of cortisol, a stress hormone, were measured from saliva samples taken before and after a nature pill, once every two weeks.

"Participants were free to choose the time of day, duration, and the place of their nature experience, which was defined as anywhere outside that in the opinion of the participant, made them feel like they've interacted with nature. There were a few constraints to minimize factors known to influence stress: take the nature pill in daylight, no aerobic exercise, and avoid the use of social media, internet, phone calls, conversations and reading," Hunter explains.

She continues, "Building personal flexibility into the experiment, allowed us to identify the optimal duration of a nature pill, no matter when or where it is taken, and under the normal circumstances of modern life, with its unpredictability and hectic scheduling."

To make allowances for busy lifestyles, while also providing meaningful results, the experimental design was novel in other aspects too.

"We accommodated day to day differences in a participant's stress status by collecting four snapshots of cortisol change due to a nature pill," says Hunter. "It also allowed us to identify and account for the impact of the ongoing, natural drop in cortisol level as the day goes on, making the estimate of effective duration more reliable."

Nature will Nurture

The data revealed that just a twenty-minute nature experience was enough to significantly reduce cortisol levels. But if you spent a little more time immersed in a nature experience, 20 to 30 minutes sitting or walking, cortisol levels dropped at their greatest rate. After that, additional de-stressing benefits continue to add up but at a slower rate.

"Healthcare practitioners can use our results as an evidence-based rule of thumb on what to put in a nature-pill prescription," says Hunter. "It provides the first estimates of how nature experiences impact stress levels in the context of normal daily life. It breaks new ground by addressing some of the complexities of measuring an effective nature dose."

Hunter hopes this study will form the basis of further research in this area.

"Our experimental approach can be used as a tool to assess how age, gender, seasonality, physical ability and culture influences the effectiveness of nature experiences on well-being. This will allow customized nature pill prescriptions, as well as a deeper insight on how to design cities and wellbeing programs for the public."


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