The temperature of your shower is what counts.
"Research has shown that cold showers, and being exposed to cold temperatures in general, increases our metabolic rate and stimulates the generation of brown fat," reports Holland and Barrett.
According to the health body, brown fat is a specific type of fat tissue that generates energy by burning calories.
Limited evidence supports this claim.
If you suffer from depression, cold showers could help improve your mood. Hydrotherapy has been used for centuries to relieve stress.
"Having regular cold showers is thought to have the same sort of effect, as they trigger electrical impulses in the brain that help to boost your energy levels, making you feel more alert," explains Holland and Barrett.