I haven’t verified the correctness of what this person is saying, but this Reddit comment seems relevant:
Most yoga breathing techniques have been completely misinterpreted from the ancient texts, and incorrectly teach people to breath larger amounts of air, when true deep breathing (deep as in from the diaphragm) is very still and almost imperceptible at rest. Buteyko teaches how to reset the part of the brain that controls autonomic breathing back to this very gentle still breath. Lau Tzu said ‘the perfect man breathes as if he is not breathing’ . The things that throw out the breathing pattern/volume (and in turn the whole body’s biochemistry) are stress and diet, and environmental toxins mostly, but once this happens its hard to reset the breath back to normal without a correct breath practice. And most yogic breathing as taught in the west is the sadly exact opposite of what is needed.
I haven’t verified the correctness of what this person is saying, but this Reddit comment seems relevant: