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Cold showers are gaining attention as a simple habit that may improve health, boost energy, and even reduce sick days. But do they actually work?
A large study conducted in the Netherlands set out to answer that question. Researchers recruited approximately 3,000 participants and asked them to follow their normal shower routine for 30 days, with one key change: each person ended their shower with 30, 60, or 90 seconds of cold water.
Cold Showers and Sick Days
At the end of the study, researchers analyzed workplace attendance data and found a compelling result. Participants who added cold water to their routine reported nearly 30 percent fewer sick days compared to those who continued taking only warm showers.
Interestingly, the length of the cold exposure—whether 30, 60, or 90 seconds—did not significantly affect the outcome. All groups experienced similar reductions in absenteeism.
These findings suggest that even a short burst of cold water may deliver measurable benefits.
Why Cold Showers May Boost Health and Energy
The cold water used in the study was around 50°F, much lower than the typical U.S. shower temperature of approximately 106°F. Despite the temperature difference, many participants adapted quickly and reported positive effects.
According to lead researcher Dr. Geert A. Buijze, cold showers may stimulate the body’s fight-or-flight response. This reaction triggers the release of hormones, increases heart rate, and elevates metabolism—all of which can contribute to improved alertness and energy levels.
Participant feedback reinforces this idea. Nearly two-thirds of individuals in the study said they continued taking cold showers after the trial ended because they felt more energized and refreshed.
Energy Savings and Environmental Benefits
In addition to potential health benefits, cold showers can significantly reduce household energy use. Heating water is one of the largest energy expenses in most homes.
Klaus Reichardt, CEO of Waterless Co., estimates that a person taking cooler showers could spend about $50 per year on energy, compared to more than $200 annually for someone who consistently takes hot showers.
Reducing hot water use not only lowers utility bills but also decreases greenhouse gas emissions associated with water heating. For sustainability professionals and environmentally conscious consumers, this makes cold showers a small but impactful behavior change.
A Simple Habit with Multiple Benefits
While cold showers are not a replacement for medical care, the evidence suggests they may help improve daily energy levels, reduce sick days, and lower energy costs. With no equipment required and minimal time investment, ending your shower with cold water is an easy habit to test.
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