What is the Buteyko Method and why does it work?

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Most of us breathe between 12 and 20 times per minute, taking in far more air than our bodies need. We've been taught that deep breathing — big, expansive breaths — is healthy. The Buteyko Method respectfully, and scientifically, disagrees.

The core idea: less is more

Developed in the 1950s by Ukrainian physician Konstantin Buteyko, the Buteyko Method is built on a single insight: chronic overbreathing is at the root of many modern health complaints — from anxiety and poor sleep to low energy and asthma.

The method teaches us to breathe less — lighter, slower, and always through the nose. Not by forcing or suppressing, but by gently retraining the body's natural breathing pattern over time.

The science: CO₂ is not the enemy

Here's what most people don't know: carbon dioxide (CO₂) is not merely a waste gas. It plays a crucial regulatory role in the body — and we need a certain amount of it to function well.

CO₂ is what triggers the breathing reflex. It's also what controls the release of oxygen from haemoglobin to the body's tissues — a mechanism called the Bohr Effect, described by Danish physiologist Christian Bohr in 1904. When we overbreathe, we exhale too much CO₂, which paradoxically reduces oxygen delivery to the brain and muscles.

Chronically low CO₂ levels (hypocapnia) have been associated with:

• Increased anxiety and stress responses
• Constriction of the smooth muscle in airways (worsening asthma)
• Narrowing of blood vessels in the brain
• Disrupted sleep patterns, particularly mouth breathing during sleep

What the research says

The Buteyko Method has been studied most extensively in the context of asthma. A landmark randomised controlled trial published in the Medical Journal of Australia found that participants practising Buteyko breathing significantly reduced their use of bronchodilator medication — by 90% compared to a 5% reduction in the control group — and reported substantial improvements in quality of life.

Subsequent research has explored its effects on sleep-disordered breathing, anxiety, and athletic performance. A 2014 study in the Journal of Alternative and Complementary Medicine found that breathing retraining consistent with Buteyko principles reduced anxiety scores and improved perceived stress in participants after just four weeks.

The BOLT score: measuring your CO₂ tolerance

One of the most useful tools in the Buteyko Method is the Body Oxygen Level Test (BOLT), developed by Patrick McKeown. You take a normal breath in, exhale normally, then hold your nose and count the seconds until you feel the first definite urge to breathe. This isn't a maximum breath hold — it's the first sign of air hunger.

A healthy BOLT score is around 40 seconds. Most people score between 15 and 25. A low score indicates high breathing volume and low CO₂ tolerance — and is associated with poorer sleep, lower energy, and higher anxiety. With consistent Buteyko practice, the BOLT score rises, and with it, wellbeing.

Nasal breathing: the foundation

Every Buteyko practice begins with the nose. Nasal breathing filters, warms and humidifies the air. It releases nitric oxide — a powerful vasodilator that improves oxygen uptake in the lungs by up to 18%, according to research by Lundberg et al. published in Acta Physiologica Scandinavica. It also naturally slows the breath, reducing overall breathing volume.

Switching from mouth to nasal breathing alone — day and night — is one of the most impactful changes a person can make to their health.

Who is the Buteyko Method for?

The Buteyko Method is suitable for almost anyone. It is particularly beneficial for people with asthma, anxiety, chronic fatigue, sleep problems, snoring or sleep apnoea, and athletes seeking a performance edge. Because it works by gently restoring natural breathing patterns, it's safe, non-invasive, and can be practised anywhere.

You don't need to be in poor health to benefit. Many people who come to Buteyko simply feel that something is off — that they're tired despite sleeping, wired despite trying to relax. The breath, it turns out, is often the missing piece.