The Case for Breathing Less
The science behind your stress – plus how to test your tolerance
Everyone has heard it. Your pulse is up, your thoughts are scattered, and someone (a colleague, an article, a well-meaning app) tells you to “take a deep breath”.
It’s not bad advice. You may want to punch them in the moment, but it really is not bad advice. Deliberate breathing during a stress response absolutely can help.
But there’s a part of the explanation that almost never gets included. And that part? It’s not about the breath you’re taking in.
What Makes Oxygen Work
Oxygen gets all the glory.
We talk about it like it’s the only thing that matters in a breath: the prize, the point, the reason we bother. Carbon dioxide, meanwhile, we treat as waste. The exhale’s job. The byproduct.
But CO2 does something critical that most people simply don’t know about.
Your red blood cells carry oxygen through your bloodstream, but they don’t release it automatically; they release it in response to carbon dioxide. This is called the Bohr effect, described over a century ago by Danish physiologist Christian Bohr.
Ultimately, your tissues don’t just passively stand by taking in oxygen like a plant does sunlight. Your cells receive the oxygen they need when there’s enough carbon dioxide present to trigger the handoff.
So CO2 isn’t just a waste product. It’s a signal that helps your body to actually use what you’re breathing in.
A Silent Pandemic
Here’s where this gets relevant to everyday life.
Chronic stress – the kind that runs quietly in the background for months – drives faster, shallower breathing. Not dramatically. You’re not hyperventilating. But the speed creeps up, the depth shifts, and over time that pattern becomes a kind of default.
Faster breathing blows off more CO2 than the body needs to lose. When CO2 drops below optimal levels, a predictable set of symptoms follows: a higher heart rate, light-headedness, brain fog, vague restlessness, a low-grade sense that something is off without a clear reason why.
Sound familiar?
These are the same symptoms most people attribute to stress or anxiety.
And they often do arrive during stressful periods… but a significant part of what you’re feeling may be due to what the stress is doing to your breathing, which is in turn affecting your blood chemistry.
The practical implication: when you’re already over-breathing, taking a big deep breath blows off even more CO2. It can feel like relief in the moment, but won’t do anything to address the underlying issue.
How Long Can You Go?
Soviet physician Konstantin Buteyko began developing his method in the 1950s after observing that many of his patients with respiratory conditions and anxiety were breathing too quickly. His central argument was that over-breathing underlies a wide range of symptoms, an idea which was very controversial.
Dr. Buteyko’s core practice is simple.
Sit comfortably. Take one normal breath in through your nose, then let it out normally through your nose. Gently pinch your nose closed and hold your breath, counting the seconds until you feel a definite signal that your body wants to breathe.
You’re looking for the first clear sign. You’re not waiting for it to become an urgent, pressing need. Don’t push for a specific number – you just want to feel that finite nudge to take in some air.
That’s your stopping point. Release, breathe gently through your nose for :10-:30 seconds, and then start again. The break should be long enough that by the time you start your next hold, you’re back to breathing calmly and lightly.
Repeat this three to five times.
That comfortable hold gives you a window into your current CO2 tolerance. A number in the twenty-something-seconds range is typical. Forty seconds or more indicates a well-adapted system and good breath control.
(If you’re surprised by how short yours is, lots of people are, so don’t feel bad!)
And you’re not just taking a test for the hell of it. Breath holds trains your body to become more comfortable with slightly higher CO2 levels. Your breathing starts getting more efficient without you even knowing it. The effect over time: less background noise, clearer thinking, a nervous system that isn’t running a low-grade alarm beneath the surface.
It’s as if your breath is asking you, almost paradoxically, to do a little less.
Last Gasp
“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.” — Antoine de Saint-Exupéry
P.S. Want more surprising tips to improve your everyday life? The Full Exhale is my free newsletter. Get a breath technique, a perspective, and a little bit of practical wellness in your inbox every week. Subscribe here, and I’ll send you three of my favorite breaths the moment you do.
P.P.S. You probably know this but I am not a doctor, I’ve never played on one TV, and what I say is not medical advice.