It is important to have positive feelings in our daily life. 

"Compared 1 some unhappy people, those who are always pleased and relaxed are less likely to suffer from colds," 2 a new study. The researchers from New York University said. "Being 3 helps the body prevent diseases."

"It seems that positive feelings may reduce the 4 of illness," said the chief researcher Sheldon Cohen.

In an earlier study Cohen found that people who were 5  caught colds less often. And they seldom told their doctors that they felt 6 . 

In this study, Cohen's team interviewed 193 adults every day for two weeks. In this 7 , the people told researchers about 8 happy or sad feelings that day. Two weeks later, all of them were made to catch colds by doctors, and they had to stay 9 in a room for six days.

The results 10  that each in the study was equal (平等的) to fall ill. 11  people who were lively and relaxed said they felt happy during the research. Their illnesses were less serious and lasted for a 12  time. 

Cohen believes that 13  people have positive feelings, their body may produce a kind of chemical that helps to 14  illnesses. So if you 15  your health, please look on the bright side and make yourself happy all the time.