From earliest childhood our brains actually link with those of the people close to us in a silent rhythm that makes up the life force of the body. These wordless ties determine our mood, stabilize and maintain our health, and change the structure of our brains, so that, in a very real sense, who we are and who we become depends on whom we love.

A General Theory of Love Thomas Lewis, MD; Fari Amini, MD; Richard Lennon, MD