Thinking out aloud here.
What makes a strong immune system and one to be healthy, no physical / chronic health conditions at all?
I find it fascination really. Some people can exercise religiously, eat a healthy and balanced diet, not smoke, not drink alcohol and seem to 'catch' anything and everything.
Yet there are others who don't look after themselves and never get sick. See, I am one of them. It's very odd, but lucky I guess. I smoke, have done for 7 years, my diet mainly consists of toast, pasta, dry biscuits and coffee - very rarely eat fruit or vegetables, don't eat meat, cheese or eggs.
It isn't genetics. My parents are always sick with gastro bugs, colds, seem to get the flu every year. Right now my Dad had pneumonia. I've got family members who have asthma, rheumatoid arthritis, type 1 and type 2 diabetes, multiple sclerosis, gallstones and had surgery to remove the gallbladder and finally cancer. There is always something wrong with most people in my family.
So what makes some people so healthy, even though environmental and genetic aspects of their lives don't explain it?
I've often thought if I had the chance I'd do some kind of clinical trial, find out what makes me so healthy compared to most people. I'd do this to help scientists and doctors make other people healthy like me.