1. Think positively
A positive outlook may mean the difference between catching a cold or not. “Happier people are less likely to develop colds when exposed to cold viruses,” says Sheldon Cohen, PhD, a professor of psychology at Carnegie Mellon University. In his research, people who described themselves as less happy, lively, and calm were about three times more likely to get sick as those who rated themselves higher in those categories. People with high positive emotion scores produce just enough cytokine (a protein) to help recruit other immune cells to fight off infections, Cohen explains.