'Blue Monday?' Most depressing day of the year is either Jan 14 or Jan 21

The theory of Blue Monday dates back to 2005, when UK psychologist Cliff Arnall created an elaborate mathematical formula to calculate the most miserable day of the year

The theory of Blue Monday dates back to 2005, when UK psychologist Cliff Arnall created an elaborate mathematical formula to calculate the most miserable day of the year. Thanks to the day's perfect storm of drab weather, holiday bills, and wrecked New Year's resolutions, motivational levels, the idea goes, hit an all-time low. The result: feeling depressed, being inactive, and eating too many carbohydrates.

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