Can forest bathing strengthen immunity for up to 30 days?

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Forest Bathing May Enhance Immune Function for Extended Periods

Forest bathing, also known as Shinrin-yoku, has been observed to potentially strengthen the immune system, with notable effects on Natural Killer (NK) cells that may last for up to 30 days following a session. This practice involves immersing oneself in nature, and research suggests that trees release compounds called phytoncides, which can positively influence the body's immune response.
Trees Release Phytoncides Affecting Immune Cells

Trees emit phytoncides, which are volatile organic compounds that have been studied for their effects on human health. According to research published in Effects of forest environment (Shinrin-yoku/Forest bathing) on health promotion and disease prevention — the Establishment of “Forest Medicine”, these compounds interact with the body's Natural Killer (NK) cells. NK cells are a crucial component of the immune system, responsible for identifying and eliminating abnormal cells, including cancer cells.
Increased NK Cell Activity Observed

Studies indicate that exposure to forest environments through forest bathing can lead to an increase in both the number and the activity of NK cells. This heightened activity is associated with an enhanced capacity to identify and eradicate cancer cells. The phytoncides released by trees are believed to be the mechanism behind this boost in immune surveillance.
Immune Benefits Can Persist for Weeks

A significant finding from the research is the duration of these immune system enhancements. The increased activity of NK cells, stimulated by forest bathing, has been shown to persist for as long as 30 days after a single session. This suggests that spending time in nature can offer a sustained benefit to the body's defence mechanisms, potentially contributing to overall health promotion and disease prevention.

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Can forest bathing strengthen immunity for up to 30 days?

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