Want to stay away from colds? ___
Compared to unhappy people, those who are cheerful and relaxed are less likely to suffer
from cold, according to a new study. _________, say the researchers from New York University.
"It seems that positive(积极的) feelings may reduce the danger of illness," said the study's
chief researcher Sheldon Cohen.
In an earlier study, Cohen found that people who were cheerful and lively caught coughs
and colds less often. _______ 
In this study, Cohen's study interviewed 193 adults every day for two weeks. During
the interviews, the people told researchers about the happy or sad feelings they had that day.
After the two weeks, the people were given colds by doctors and had to stay alone in a room for
six days.
____
But for people who said they felt happy during the  research  period , their illness was less
serious and lasted for a shorter time.
Cohen believes that when people experienced positive feelings, their body may produce
a chemical that helps fight illness and disease. _______