Why is smiling good for you?

It is not surprising that feeling good about oneself can lead to feeling good period. Numerous studies have shown associations between positive self-image, self-esteem, optimism and better health. Conversely, people who have low self-esteem, poor self-image, or are pessimistic tend to have more depression and anxiety, weaker immune systems, and poorer recovery from illness.

One study of 999 men showed that those who tended to look on the bright side had a decreased risk of death from heart disease.

It isn't just positive thinking that is important, however. The act of smiling itself has been shown to be good for one's health. Simply changing your expression to a smile or mimicking another's smile can cause involuntary biological changes just like those induced by emotions. Research has also revealed that smiling can lower blood pressure, release natural painkillers called endorphins, increase serotonin (a target of antidepressant drugs) and reduce stress. Looking at others' smiles, especially those of babies and children, causes positive chemical changes in the brain. Research on laughter has shown that it relaxes arteries and improves blood flow.