Started by the U.K. charity Alcohol Change, Dry January encourages people to swear off drinking for the first month of the year.
The campaign has spread to a global event with 4 million people taking part as of 2020.
Research from the University of Sussex published in 2018 shows that participating in Dry January can have positive outcomes throughout the year, even for people who don't make it all month without a drink.
1. Reduce drinking throughout the year
Once Dry January ends, participants tend to drink less in the following months, reporting that they drank one less day per week and had one less drink when they did partake.