From the Washington Post:
There is a growing body of research indicating that a good guffaw may improve immune function, help lower blood pressure, boost mood and reduce stress and depression. And despite a dearth of more rigorous, long-term studies, the sum of these findings is compelling, says cardiologist Michael Miller, a professor at the University of Maryland School of Medicine who has researched the topic.
“We don’t have any clinical outcome evidence to show that laughter will reduce heart attacks or improve overall survival. However, we do have a number of studies that have shown that there is a potential upside, in terms of vascular benefits and also overall health,” he explains. “These findings certainly support laughter as a reasonable prescription for heart health and health in general, especially since there’s really no downside.”
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