Nasal breathing positively impacts testosterone and estrogen by improving sleep quality, which supports gonadal function.

“nose-breathing in wakefulness and in sleep promotes all sorts of positive things related to not just cosmetics, but also the improvement of gas exchange of carbon dioxide and oxygen in the body, and as well, it can modify levels of different neurotransmitters and neuromodulators in ways that positively can impact hormones”

“when you go into the scientific literature, it comes through as one of the most powerful things that you can do that is zero cost, takes a little effort but it's zero cost, and it has all of these positive effects across the board, you know, both cosmetic and in sleep and hormonal, et cetera”

“So here's how this works, there's now a lot of literature showing that breathing through the nose, not through the mouth, is powerful for improving lots of things, first of all, it improves cosmetic features of the jaw and face, this was first well-established by my colleagues at Stanford in a book called "Jaws: The Story of a Hidden Epidemic," by Sandra Kahn and Paul Ehrlich, who are both faculty at Stanford, has a forward by Robert Sapolsky, the great Robert Sapolsky, and it also has a heavy endorsement upfront by Jared Diamond, the author of "Guns, Germs, and Steel," the Pulitzer winner, so a lot of heavy hitters on this book, "Jaws." It's not a book that a lot of people know about, unfortunately, but it really describes the benefits of nasal breathing and the terrible things that happen when people, in particular children, but adults also, are heavy mouth-breathers, so mouth-breathers have changes in the cosmetics of their face and jaw that are really bad in terms of attractiveness, and this was done in twin studies, you can look in the book and see some of this, it's really dramatic how being a mouth-breather tends to make the chin drop back behind the upper mandible, there's a lengthening in the face, a drooping of the eyes, it can be quite dramatic or modest depending on how much mouth-breathing. Now, sometimes we have to breathe with our mouths, but there's also a lot of data and studies described in this book, "Jaws," that describe how nose-breathing in wakefulness and in sleep promotes all sorts of positive things related to not just cosmetics, but also the improvement of gas exchange of carbon dioxide and oxygen in the body, and as well, it can modify levels of different neurotransmitters and neuromodulators in ways that positively can impact hormones, so believe it or not, being a nasal-breather and avoiding being a mouth-breather can actually positively impact hormones, and in particular, the hormones testosterone and estrogen, although the way that it does that is by making you a better sleeper, which allows you to produce more testosterone and the appropriate amounts of testosterone and estrogen, but it does that in part through indirect mechanisms because deep sleep supports the gonads, the ovaries and the testicles and their turnover of cells”

“so believe it or not, being a nasal-breather and avoiding being a mouth-breather can actually positively impact hormones, and in particular, the hormones testosterone and estrogen, although the way that it does that is by making you a better sleeper, which allows you to produce more testosterone and the appropriate amounts of testosterone and estrogen, but it does that in part through indirect mechanisms because deep sleep supports the gonads, the ovaries and the testicles and their turnover of cells”

“learn to a nasal breather has positive cosmetic effects it reduces apnea it offloads more carbon dioxide it increases lung capacity it dilates the sinuses and it prevents apnea in sleep so unless you have severe apnea and you need the CPAP Nas becoming a nasal breather can have all sorts of positive effects by reducing cortisol reducing apnea and indirectly raising testosterone and estrogen in the proper ratios”