- The effect of phytoncides.
One lesser-known but scientifically proven reason to spend more time in nature is the effect of phytoncides. These substances are released by trees, especially conifers, birches, oaks, and eucalyptus. Their main role in nature is to protect the plants from bacteria, fungi, and pests. For humans, however, they work quite differently: they improve mood, reduce stress levels, and help promote deeper, more restful sleep. When you walk in a forest or park, phytoncides enter your body through the respiratory tract. In Japan, there is even a special form of therapeutic walking called “forest therapy.” Doctors recommend it for people suffering from insomnia or anxiety. Studies show that after several days spent among trees, melatonin production — the sleep hormone — normalizes. Just 20–30 minutes daily in a green area, even in a city park, is enough.
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