Lead author Mohammad Siahpush of the University of Nebraska Medical Center in Omaha said his study shows that people who are happy and satisfied with their lives might be healthier.

The researchers looked at data from Australian surveys conducted in 2001 and 2004. Nearly 10,000 adults responded to items about health indicators including the presence of long-term, limiting health conditions and physical health.

They used the question, "During the past four weeks, have you been a happy person?" to assess happiness. They determined satisfaction with life by asking: "All things considered, how satisfied are you with your life?"

Happiness and life satisfaction at the baseline survey were both associated with excellent, good or very good health; the absence of long-term, limiting health concerns and higher levels of physical health three years later.

"There are indications that as you become happier and more satisfied with your life, you tend to become healthier as well," Siahpush said in a statement.

The study appears in the September/October issue of the American Journal of Health Promotion.

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