Breath: The New Science of a Lost Art

The summary

How you breathe matters more than how much. The difference between the nose and the mouth, and between fast shallow breaths and slow controlled ones, can reshape your face, alter your health, and even predict how long you’ll live. Modern medicine has mostly looked past this, treating chronic congestion as normal and tinkering with sinus symptoms rather than their causes.

The nose is not optional

Your nasal passages and sinuses developed specifically to process air; your mouth did not. Breathing through your nose filters, warms, and moistens the air, and it releases nitric oxide, a chemical that lowers blood pressure and regulates heart rate. The nasal cycle, in which your two nostrils trade dominance through the day, helps balance temperature, blood pressure, and brain chemistry. Breathe through your mouth and you bypass all of it.

Mouth breathing also does active harm. It lowers pressure in the airway, which lets the soft tissues at the back of the mouth flex inward, leaving less room and making breathing harder — so mouthbreathing begets more mouthbreathing. When Nestor breathed only through his mouth for ten days as part of a study, his blood pressure climbed, his pulse raced, his temperature dropped, his sleep fell apart, his oxygen levels fell, and he felt miserable and foggy. An experiment with monkeys was starker still: two years of mouth breathing severely deformed their heads and teeth, though normal breathing eventually restored them. About half of us breathe mostly through our mouths.

We shrank our own airways

We’ve devolved in ways that sabotage breathing. When our ancestors switched to cooked, tenderized food, their brains grew larger — but the bigger brain crowded the sinuses and pushed out the nose, and the airway narrowed. Modern processed diets, soft and barely chewed, have weakened and shrunk our facial structures further, which is why snoring and asthma have become common. Cultures without the modern diet mostly don’t suffer these problems. In the 1830s, researcher George Catlin traveled among more than 50 indigenous groups whose diets ranged from all-meat to nearly vegetarian; almost all had wide mouths, broad nasal openings, near-perfect teeth, and excellent health, and all breathed through their noses. Catlin adopted the habit himself, cured his own respiratory trouble, and wrote a book urging people to “shut your mouth.”

The damage can be reversed. New orthodontic findings show that chewing motions stimulate stem cells that grow facial bone. Nestor used a Homeoblock mouthpiece that simulates extra chewing for a few weeks; it widened his airways, realigned his jaw, and spurred two cubic centimeters of new facial bone.

Slower breath, longer life

The single best predictor of lifespan turned out not to be genetics, diet, or exercise, but lung capacity. And the way to build it isn’t to breathe more — it’s to breathe less, and slower. Carl Stough, a choir director with no medical training, helped patients with chronic lung disease after realizing they never fully exhaled; teaching them to engage the diaphragm and empty their lungs boosted their capacity, and he later applied the method to Olympic athletes.

Spiritual traditions across many faiths landed independently on breaths of about 5.5 seconds during prayer and meditation — as do nature-based practices like Japanese forest bathing. The reason is chemistry. Slow, shallow breathing retains more carbon dioxide, which dilates blood vessels, improves circulation, and makes oxygen delivery more effective. The balance of oxygen and carbon dioxide matters more than the sheer amount of oxygen, which is why oxygen bars do nothing — you simply exhale the excess. Training the body to tolerate slightly more CO₂ can even raise VO₂ max, the best gauge of cardiorespiratory fitness. Just five to ten minutes a day helps: inhale for about 5.5 seconds, exhale for 5.5 seconds, breathing shallowly through the diaphragm, for roughly six breaths and 5.5 liters of air a minute. As a bonus fact from the same physiology, the lungs are the body’s weight-regulating system — for every ten pounds of fat you lose, about eight and a half leave through your breath as carbon dioxide.

Extreme breath, extreme states

Because the lungs interact constantly with the autonomic nervous system, pushing your breathing to extremes can produce seemingly superhuman feats. Tibetan monks use Tummo, or “inner fire,” to stay warm in the cold. The yogi Swami Rama could slow his heart nearly to a stop or drive it to 300 beats a minute and shift his temperature and brain waves through breath and visualization. Wim Hof ran a half-marathon barefoot and shirtless in the Arctic using short, aggressive bursts of breath. These methods are controversial and not for casual practice. Stanislav Grof, an early LSD researcher, developed Holotropic Breathwork to induce hallucinations through heavy breathing after the drug was banned, and carbon dioxide therapy deliberately triggers brief panic attacks followed by deep calm to treat anxiety. Ancient Eastern traditions grasped this power long ago through ideas like prana and chi, the life force carried on the breath.

The bottom line

Breathe through your nose, slow to about six breaths a minute, and engage your diaphragm — small changes that can widen your airways, lower your blood pressure, and lengthen your life. Read this if you snore, struggle with anxiety, want better athletic stamina, or simply want to fix a bodily function you’ve been doing wrong your whole life.