HAPPY PEOPLE MORE IMMUNE TO COLDS
People who are energetic, happy and relaxed are less likely to catch colds.
Those who are depressed, nervous or angry are more likely to complain about cold symptoms, whether or not they were exposed to cold germs, according to a study by Carnegie Mellon University and published in Psychosomatic Medicine.
Study participants who had a positive emotional style weren't infected as often and experienced fewer symptoms compared to people with a negative emotional style, researchers say.

hah. moral of the story. don't get colds:D whether you're happy, sad, elated or depressed:D