Spending just 20 minutes walking or sitting in a natural setting can significantly lower your stress hormone levels. This finding comes from a pioneering study that pinpoints the optimal 'dose' of urban nature exposure for maximum stress relief.
"We know time in nature eases stress, but until now, we lacked specifics on duration, frequency, and type," explains the study's lead author. "Our results show that 20 to 30 minutes of sitting or walking in a place that connects you to nature delivers the biggest drop in cortisol, the key stress hormone."
Nature exposure offers a cost-effective antidote to the health toll of urbanization and screen-heavy lifestyles. To determine an effective dose, researchers ran a practical experiment.
Over eight weeks, participants took 'nature pills'—immersions lasting 10 minutes or more—at least three times weekly. Cortisol levels were measured via saliva samples before and after these sessions, every two weeks.
The results? A 20-minute nature session significantly reduced cortisol. Extending to 20-30 minutes accelerated the drop most effectively, with benefits continuing but tapering off beyond that.
