Research reveals that environments can increase or reduce our stress, which in turn impacts our bodies. What you are seeing, hearing, experiencing at any moment is changing not only your mood, but how your nervous, endocrine, and immune systems are working.
The stress of an unpleasant environment can cause you to feel anxious, or sad, or helpless. This in turn elevates your blood pressure, heart rate, and muscle tension and suppresses your immune system. A pleasing environment reverses that.
And regardless of age or culture, humans find nature pleasing. In one study cited in the book Healing Gardens, researchers found that more than two-thirds of people choose a natural setting to retreat to when stressed.