Happiness may be good for your health.
A recent study at John Hopkins found that people who had a positive outlook on life had a lower incidence of heart attacks and other cardiovascular issues. In fact, when examining data over a 25 year period, those with lower anxiety, higher energy, and a better mood had 1/3 fewer coronary issues.
There is controversy over whether individuals can change their temperament; it may be something we are born with. However, we can all find activities to lighten our mood and engage in behaviors that make us happy. Seek treatment for depression and anxiety, and remember that the glass is half full, not half empty!