What science says about loneliness

A child's rocking horse is left behind
A child's rocking horse is left behind in a foreclosed home in Bloomington, Minn.
MPR Photo/Nikki Tundel

A host of physical and mental ailments like sleep disorders, depression, weakened immune system, and high blood pressure are being linked to loneliness in adults.

Some argue that our increasingly computer-networked society should keep us from being lonely, but one expert argues that online friends are no replacement for real ones.