I think cycling has made me healthier, I was hardly ever ill in 2013, apart from a virus back in May, but even then I was back at work within 2 days, despite being told to take a week off.
I've had a couple of colds threatening to appear in the last few months, but I seem to have fought them off within a few days with minimal symptoms. Everyone at work seems to have suffered a lot more with the last cold bug that has been going around.
My official position in my morris side is that of Foreman, to the uninitiated, that means I teach the dances. Prior to returning to cycling in spring last year I was barely able to dance a whole dance without becoming out of breath a hence unable to encourage (shout at) the other men. Now I dance most every dance in the two hour practice and encourage the other men at the top of my voice throughout. I think it's an improvement, they are not so sure.
I am in love with your morris emoticon. (Mr Ganymede used to be a Mr Jorrock).
A link as people love links
http://sportsmedicine.about.com/od/injuryprevention/a/Ex_Immunity.htm
Personally, I suffered from sex addiction. I'm now deeply in love with my bike, and over this problem.