"Previous studies have shown that depression is associated with health problems compared to average emotional states. But few studies have looked at the effects of positive moods on health. Now, researchers at University College London, UK, have linked everyday happiness with healthier levels of important body chemicals, such as the stress hormone cortisol."

"�This study showed that whether people are happy or less happy in their everyday lives appears to have important effects on the markers of biological function known to be associated with disease,� says clinical psychologist Jane Wardle, one of the research team. �Perhaps laughter is the best medicine,� she adds."

"�This is the best data to date that associates positive emotional feelings with good effects on your health,� says Carol Shively, at Wake Forest University Baptist Medical Center in Winston-Salem, North Carolina, US. �We usually concentrate on things that are either bad or wrong, rather than good or right.�"

"The team studied 216 middle-aged men and women living in London, UK, who are part of the ongoing �Whitehall II� study of thousands of civil servants, led by Michael Marmot."

"This subset was asked to rate how happy they had been feeling in the last five minutes at about 33 points during their working or leisure days. At these points, their heart rates and blood pressures were also measured by an automated system."

"Saliva samples were also taken from the volunteers at eight points during a working day and a leisure day to test levels of the stress hormone cortisol. On one occasion, the subjects were invited into the lab and given a �mildly stressful� task to perform while their biological responses were measured. The team controlled
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