TIL: Cold showers have a potential to treat depression

This study hypothesizes that cold exposure activates the sympathetic nervous system and increases the release of noradrenaline in the brain.

The same study also purports that a “cold shower is expected to send an overwhelming amount of electrical impulses from peripheral nerve endings to the brain, which could result in an antidepressant effect.”

Another study found that bathing in cold water reduced levels of cortisol.