Please tell website users that they have to be very careful if they have low body weight and use the "cold shower" method to alleviate depression. I have low blood circulation and several health problems because I am suffering and losing to an eating disorder. Cold showers can be dangerous!
For people who are "underweight" it may be a good idea by slowly decreasing the temp. each time you take a shower, followed by taking your temperature afterward.
Core Temp. Side Effect
Measuring the length of the shower is important, as the longer you expose your self to cold water, the lower your body temperature will drop.
I hope this helps, and as always; if you think you may have an eating disorder, you may have one, or develop one!