(1) Introverts versus extroverts
Outgoing, sociable people have the strongest immune systems, a recent study finds. Those who are the most careful, though, are more likely to have a weaker immune system response.
(2) Optimists versus pessimists
Optimists have healthier hearts than pessimists, a study of over 51,000 adults has found. Optimists also had healthier body mass indexes, were more physically active and less likely to smoke. Overall, researchers found that the more optimistic people were, the greater their overall physical health.
(3) Conscientiousness
Men with conscientious personality traits and those who are open to experience live longer, a study has found. For women, those who are more agreeable and emotionally stable enjoy a longer life.
The kicker is that it’s your friends — not you — who are better at judging these personality traits from the outside and consequently predicting how long you will live.
Our study shows that people are able to observe and rate a friend’s personality accurately enough to predict early mortality decades down the road. It suggests that people are able to see important characteristics related to health even when their friends were, for the most part, healthy and many years from death.”
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Source material from Psyblog