Cortisol is the human body’s stress hormone, fueling the "flight or fight" instinct. Once a perceived threat goes away, cortisol levels should even out. If they remain elevated, a person continues to feel stressed. Researchers measured cortisol levels for two participant groups: a gardening group and a reading group. They found that while both activities reduced cortisol levels, the gardening group showed significantly higher decreases than the reading group.

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