How some women never get sick - by staying positive

In one study, participants who had heightened activity in a region of the brain associated with a positive attitude produced greater amounts of flu antibodies.

In one study, participants who had heightened activity in a region of the brain associated with a positive attitude produced greater amounts of flu antibodies. Another study showed that people with sunny dispositions churned out more antibodies in response to vaccinations.

"the brain communicates with the immune system, and vice versa," - Anna L. Marsland, PhD, director of the Behavioral Immunology Laboratory at the University of Pittsburgh