It is actually true that cold water stimulates our skin's thermoreceptors and thus influences our central nervous system, skeletal muscles, blood vessels and sweat glands. Taking a cold shower can positively impact our cardiovascular system. Our body has to get used to these thermal stimuli and this helps improve the skin's blood circulation. At the same time, we become more resistant to cold stimuli in general, which can positively impact the immune system. However, researchers of a Dutch study cannot completely confirm this as their participants reported sick more often at work at the beginning of the test phase (taking cold showers for 30, 60 or 90 seconds a day for a month). Yet, they were able to observe an overall improved immune system and well-being of participants. It is not scientifically proven that cold showers help with losing weight. 

Who is now eager to take a cold shower should take it easy. Always start with warm water and when feeling already cold then do not try this out as it can lead to getting a cold. 

The BR show "Gesundheit" has made a video on this topic. Click here to watch it.