The conclusions of this study were relayed by Géraldine Zamansky, journalist for the Magazine de la Santé on France 5. According to her, this research has highlighted objective effects on blood pressure, depression and anxiety. Cortisol, the stress hormone, is a key element in the balance of our body. Prolonged exposure to high cortisol levels increases the risk of chronic diseases such as high blood pressure and diabetes. Furthermore, this also weakens our body’s immune defensesmaking us more vulnerable to viral and bacterial infections.
To help patients manage stress, Dr. Melissa Lem, who leads Canada’s National Prescription Nature Program, recommends spend 20 minutes a day surrounded by nature. This dose was established from a 2019 US study which showed that even a brief exposure to nature may reduce cortisol in saliva. After just five minutes in a park, cortisol levels drop, but following 20 minutes the drop becomes much greater. Dr. Lem also points out that the benefits of nature do not necessarily depend on the size of the green space. The main thing is to feel the presence of nature and fully immerse yourself in the environment around us. Even a small garden or square can provide the desired benefits, as long as the focus is on the newly emerging spring plants, flowers and leaves. It can be a great way to relax and recharge, even in an urban setting.
Dr. Lem encourages people who are reluctant to spend more time in nature to participate in accompanied activities. Indeed, the development of group activities such as hikes or community gardens might help stimulate enthusiasm for nature. However, for now, it all depends on the proximity to green spaces and the availability of everyone to spend time there.
