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"In 2006 researchers investigating the interaction between the brain, behavior, and the immune system found that simply anticipating a mirthful laughter experience boosted health-protecting hormones. Now, two years later, the same researchers have found that the anticipation of a positive humorous laughter experience also reduces potentially detrimental stress hormones. According to Dr. Lee Berk, the study team\u2019s lead researcher of Loma Linda University, Loma Linda, CA, \u201COur findings lead us to believe that by seeking out positive experiences that make us laugh we can do a lot with our physiology to stay well.\u201D"^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2008-04-stress-hormones.html>