Keep a positive attitude.

Since 1986, University of Kentucky scientist David Snowdon has been studying 678 nuns hoping to discover secrets of the brain. In particular, what happens to the brain as we age. His findings, known as the Nun Study, have shed some light on how to live a mentally active life well into old age. One of his findings is that a positive emotional state at an early age might help ward off disease and even prolong life. In fact, there is a growing body of literature that shows a correlation between a person’s attitude and their physical health, mental health, and longevity.