I have known the buteyko technique before Ray Peat's diet and have found it to be the most health balancing thing that ever happened to me. It is about breathing less, by inhaling less and holding breath alot. This will built up the CO2 saturation deep within the tissues very easily and promote oxygenation and therefore metabolism. Balancing the thyroid (Ray Peat inspired diet) is a big help in increasing oxygenation.
I find it therefore highly unsatisfying that Ray Peat doesn't give Buteyko the props it deserves. He gives a little nuance to it, yes, Buteyko claimed that it has all to do with breathing less. That is not always true, as Peat said, some people who have a low metabolism can breathe very slowly but still have a CO2 saturation in the tissue that is not sufficient to sustain the regenerative abillities.
However, Artour Rahkimov from normalbreathing.com has posted several health states and parameters to measure your health. Such as the CP (control pause), which is the length of a breath hold after the exhale, during your natural breathing pattern at that time, after which you don't need to have a bigger inhale than you naturally do (i.e. no stress signs). If the CP is above 40s your health will start to normalize. Most people are around 15-20s CP, in the beginning of the century it used to be around 40s. Mine was 15s, now I'm up to 35 seconds for about a year with eventual breakthroughs above 40, but couldn't stay there for longer than 2 days or so. Buteyko claimed that breaking through the 40s CP barrier is the toughest challenge in the method, because after it is impossible to have a chronic focal infection.
The nice part of it is that Artour's experience has learned him that gut health is always normal (i.e. no stains on toilet wall and toilet paper during the regular bowel movements), that sleep is reduced to 6 hours, that you start craving light aerobic exercise. These are all things I have seen changing everytime I got above 40s CP and from people I know who are also struggling with breaking 40s CP have experienced the same. One of my big issues is a gut that has dysbiosis and athlete's foot and dandruff problems that always start to kick in very heavy after I break the 40s CP, then my body recognizes that infections and due to probable all the prostaglandins and inflammatory signals it damages itself so badly that it will drop below 35 again and I will have lighter problems with these chronic inflammation issues.
Because of the major changes in health that have been very well documented in anecdotal reports of people practicing buteyko (such as reduction of sleeping time, normalization of heart beat of around 60-70 bpm, no stains on toilet paper after bowel movement). I think it is a shame that Ray Peat never dig any further in this issue. How many of you are practicing buteyko? What is your CP?