Westbury, New York area’s Valerie Varnuska pursues a number of outdoor hobbies. Valerie Varnuska appreciates the mental and physical benefits of spending time in nature. The health benefits of spending time in nature are well-documented, although the reasons behind the benefits are less clear. According to research from Qing Li, a physician at Japan’s Nippon Medical School Hospital and the president of the Japanese Society of Forest Medicine, at least some of the benefits of spending time in nature can be attributed to phytoncides, which are released from trees and plants into the air. These antibacterial and antimicrobial substances help fight disease and protect plants from harmful organisms. When people spend time in nature, we inhale phytoncides. In several studies, phytoncides have shown to improve health, boost immune function, reduce stress hormone levels, and increase the production of anti-cancer proteins. Moreover, exposure to phytoncides helped subjects relax and experience improved moods.