Not Laughing Enough
Having a sense of humor and being able to laugh at yourself positively affects both your mind and your heart. A 2009 study from the University of Maryland Medical Center published in the journal Nature found that laughing makes the inner lining of blood vessels expand and increase blood flow, which improves your heart health.
An earlier study from the same researchers found that people with heart disease responded to questionnaires with less humor to everyday life situations than those with a normal cardiovascular system. So, laugh often!