Agree... It has something to do with your genes.

Some people are very negative, but they seem to be healthy at least for now, but not sure about the future. Everyone gets sick at certain point in his life and eventaully die......You just have to accept what hit you in life when you are sick. I'd say that people who are sick tend to be more positive as they know they have to be that way to live better as they are tortured by the illness itself. They do not want to be bothered by any negative thoughts to further impact their quality of life.