Daily cold showers may lead to a significant reduction in sick days and an overall improvement in well-being, according to research from the University of Basel.
Participants who took cold showers daily reported feeling ill on 26% fewer days and took 31% fewer sick days compared to those who took warm showers. The study, published as part of Dr. Lena Glaser's PhD thesis, suggests that this effect could be linked to both physiological and psychological benefits.
Previous studies have indicated that regular exposure to cold water can increase immune response signals in healthy individuals. Cold water immersion, similar to cold showers, has also been shown to produce immune-boosting effects, potentially helping the body ward off illness. Furthermore, research suggests that cold water exposure can lead to noticeable reductions in stress and anxiety levels. While participants in the study noted feeling more awake and refreshed, and some reported small improvements in well-being and skin health, these latter effects were not statistically significant.
Dr. Glaser noted that while taking a cold shower is not always pleasant, it is a small change that can be integrated into daily routines. The study advised participants to turn their showers "as cold as possible," with flexibility to adjust based on individual comfort levels each day.
Beyond health benefits, the research also highlighted the environmental advantages of cold showers. Cold water requires less energy to heat, and individuals tend to use less water overall due to shorter shower times. For instance, lowering shower temperature from 40°C (104°F) to 15°C (59°F) can save 1.3 kWh of energy per shower. Over 12 weeks, participants in the cold shower group reduced their CO2 emissions by approximately 15kg, equivalent to driving 60 miles.
Dr. Glaser emphasized an empathetic approach to encouraging behavioral change for environmental reasons. Encouraging habits that provide personal benefits, rather than demanding sacrifices, can lead to greater motivation and adherence. This approach, she suggests, is more effective for long-term well-being and sustainability, as frequent illness also negatively impacts the environment.
The study also mentioned that while some participants dropped out initially, the dropout rate stabilized, suggesting that people adapted to the cold water over time. The benefits of cold showers, according to a review cited in the notes, may include reduced inflammation, improved sleep, and higher quality of life, alongside energy and water savings.
