The big idea: is it time to stop worrying about stress?

In the late 19th-century America, a somewhat bizarre form of abstinence emerged. The vice was not alcohol but anxiety. Citizens of New York began to attend regular “Don’t Worry Clubs” in which they encouraged each other to look on the bright side of life. Their founder, Theodore Seward, argued that Americans were “slaves to the worrying habit”, which was the “enemy which destroys happiness”. It needed to be “attacked” with “resolute and persevering effort”.

By the early 20th century, the psychologist William