I tried this a while back with a pulse oximeter on. Didn't like what I saw. Was my first and last time.
Do you have a source that this kind of mild hypoxia is harmful to the brain, or is that just your conjecture? You may be right, but I’m skeptical. Starvation isn’t great for us, but there are many health benefits associated with fasting.
The benefits of fasting aren't that clear.
Maybe another 146,000 papers [0] would start to clarify?
I’m not an expert, but my understanding is that there’s a large body of research showing many benefits to fasting. That, plus anecdotal evidence from myself and others, is all I have to go on :)
When somebody on HN says don't do something, it usually comes from a place of misinformed half baked knowledge of the subject so I say ignore these alarmists who think people are going to kill themselves by holding their breath after increasing oxygen in blood by several folds.
Not increasing oxygen. Decreasing co2.
Your blood oxygen saturation is generally 98% or more. You can't increase that several fold.