In a time of year when many are used to sun bathing, another kind of bathing proves not only safe, but beneficial. A recent New York Times Health featurette explores the claim that exposure to plants and parks can boost immunity.

"Forest bathing," a term adopted from the Japanese practice of visiting nature parks for therapeutic effect, does in fact appear to have health benefits, according to a series of recent studies. Venturing into forests or parks with lots of trees - if pollen sensitivity and the discomfort of summer heat allow - increases immune function.

Stress reduction and phytoncides, "the airborne chemicals that plants emit to protect them from rotting," and insects seem to responsible for the benefit to humans.

One January study followed 280 healthy individuals in Japan who practiced forest bathing, Shinrin-yoku in Japanese. The people were split into two groups, one which walked through a forest or wooded area for a few hours, and the other which walked through a city area. The following day, the group switched places. Scientists found that being in the forested areas created "lower concentrations of cortisol, lower pulse rate, and lower blood pressure," among other health benefits.

Other studies have demonstrated that visiting nature-rich areas raises white blood cells. For instance, one study found a week-long increase in white blood cells in women exposed to phytoncides in forest air. This summer, boost your immune system, get exercise, and enjoy some natural scenery by some forest bathing.

To read more, see this article.