[watwut]

I found it by clicking on reference in wikipedia the parent quoted. Here is full study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4094425/

> However I should note that I randomly ended up in one of his workshops years back and he actually did claim that gradually increasing exposure does make you better at cold. It wasn’t the main thing but he did claim it.

Ah, ok. I personally find that part uncontroversial, winter swimming clubs are pretty much thing where I live and they claim same thing. The thing I perceived as controversial/disbelieved were breathing techniques, superior body control and wild health benefits. Again, winter swimming clubs here claim health benefits too, but you are supposed to become less vulnerable to common cold and such rather then curing diabetes or cancer.

[graeme]

Yeah I would be very surprised it the body has no methods of cold adaptation frankly.