Happiness Is the Best Medicine

An interesting Wired article: Happiness Is the Best Medicine.

The pursuit of it was written into the Declaration of Independence, but finding the causes and effects of that elusive "it" -- happiness -- has been notoriously difficult.

Whatever brings you happiness, be it large breasts, lots of money, respect from your peers, a large bar of chocolate or even semen, it's hardly controversial to say that happy people are generally healthier than unhappy ones. That conclusion might be intuitively obvious, but just why are happy people healthier?