There is not only the issue of radiation and irregular sleep as a health risk. I do also know a lot of collegues who live a very unhealthy lifestyle in general: Eating, drinking, lack of body exercise, high body mass index, smoking, promiscuity, stress etc. Do you want to know more?
Pilots are in general more conservative people, less influenced by new fashions and ideas, and therefore somewhat immune to new movements in health and living.
Dani