FOUR!

Researchers say that doing a few good lifestyle things can do a lot of good for your lifespan. The scientists at the Centers for Disease Control and Prevention saw it when they looked at national health survey data and death records.

The CDC's Ursula Bauer:

"People who practiced all four healthy lifestyle behaviors were 63 percent less likely to die of heart disease, cancer, and other diseases." (10 seconds)

The healthy behaviors are: not smoking, eating a healthy diet, doing moderate or vigorous physical activity, and drinking alcohol in moderation if you drink at all.

People who did some behaviors but not others still got some benefit. Researchers say the one with the biggest impact was not smoking.

The study was in the American Journal of Public Health.