>>12358126>>12358189He's basically doing a regime of hyper-ventilation and breath holding to pump his blood with as much oxygen as possible. This changes the blood pH. The pH change and the increase in oxygen basically put him into a state of increased immune system activity and metabolic activity. Research has backed up his claims about using this to fight diseases, infection, and as he's more famous for, withstand intense cold for long periods of time. You can also do this to hold your breath for longer. This isn't new, Vajrayana Buddhism came up with this (albeit through what someone who uses the term "pseudoscience" might call "huck and woo") like a thousand years ago, it's called "Tummo". I would be shocked if no one else came up with it earlier, people have been doing Pulmonautics for a long time.
But it's still just hyper-ventilating and then holding your breath, and holding your breath for long periods of time can result in damage to the brain. So, the question isn't "Is the Wim Hof method bad for you", because the answer is no, it's "does the process of achieving the biological states necessary to do the Wim Hof cause damage", and the answer is probably, certainly if you do it wrong. The question is how much damage. Swimmers hold their breath for long periods of time, for example, and yet most swimmers aren't clinically retarded.
People have died doing Wim Hof's shit, but not from brain damage, but rather from doing his "crack a hole in the ice, dive under, and hang out under water under the ice for ten minutes" thing, with the added trick of "pass out under water from hyperventilating", which leads to them drowning.
