Being happy could reduce your risk of developing heart disease. Researchers from Columbia University Medical Centre in New York assessed 1,739 adults at the start of the study. They recorded their general health and measured symptoms of depression, hostility, anxiety and the degree to which they expressed positive emotions. They then tracked the participants' health over the next ten years. The study found that for each point scored on a 'positivity' scale the risk of developing heart disease over the next ten years dropped by 22%.
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