This is a long list, but everything matters.
An educated person is more likely to be healthy than someone who is illiterate. Married people live longer than those who are single. Those who starve themselves don’t do as well as those who eat sensibly but with some control. Those in high pressure jobs tend to have poorer health than those who have control over their work-lives. And so on and so forth…these are issues we will discuss as we go along.