“Looking inside our body gives greater clues. And a trickle of recent findings has recently turned into a torrent, as studies are now revealing how personality is linked with many aspects of our biology, from our hormones and our immune system to the microbes in our gut.
These are important discoveries because personality – especially the traits of conscientiousness and neuroticism – is strongly associated with our future mental and physical health and longevity. Uncovering the physiological basis of personality might help explain why.”
Spiritual Wrestlings 