Taking regular cold showers may help people stay healthier, according to a study by a psychologist at the University of Basel in Switzerland. Participants who stuck with cold showers for 12 weeks took 31% fewer sick days on average than a control group.
The study included 719 healthy participants aged 18 to 65 who did not already take cold showers. They were asked to shower as cold as their shower would allow for 12 weeks. Many dropped out in the first two weeks, but the dropout rate declined afterward, which the researcher, Dr. Glaser, said suggests people gradually get used to it.

As the study went on, the remaining participants reported feeling increasingly better both mentally and physically, and said cold showers left them feeling more awake and refreshed.
Glaser, who carried out the research for her doctoral dissertation at the university's Faculty of Psychology, set out to test whether people are more willing to adopt climate-friendly habits that are easy to fit into daily life and offer personal rewards. She said changing shower habits has an environmental impact comparable to recycling and can also save money. "Taking a cold shower isn't exactly pleasant, but it's a small change to make," she said.