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Nasal breathing and mouth taping

Small laboratory studies in healthy adults show that breathing only through the nose during easy or moderate exercise lowers ventilation and breathing rate, while nasal-only breathing at maximal effort lowers peak exercise capacity. Humming raises nasal nitric oxide sharply in healthy adults, but no health outcome of this has been tested. Evidence on taping the mouth shut during sleep is limited to about ten small, mostly uncontrolled studies: some found less snoring and fewer breathing pauses in mouth-breathers with mild obstructive sleep apnoea, others found no difference, and reviews warn of serious risk where the nose is blocked. No claim reaches moderate or high certainty because every finding rests on a few small, short, mostly unrandomised studies of physiological markers rather than health outcomes.

Evidence retrieved up to

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5 research claims

Marks

What the research shows

In a crossover study of 19 healthy adults cycling for 60 minutes at a self-selected low intensity, nasal-only breathing lowered total ventilation and breathing frequency compared with unrestricted oro-nasal breathing, with no difference in rated effort and marginally higher discomfort. In a second crossover study comparing exclusively nasal with exclusively oral breathing during 5 minutes of moderate cycling, nasal breathing produced slower, deeper breathing in all groups, including young and older healthy adults. Whether these acute changes affect fitness or health over time has not been studied.

No known concerns at usual amountsUnclear

Who this is about

healthy adults during low- to moderate-intensity cycling

Details and sources

Practical note

Graded low: two small single-session crossover studies (19 healthy adults in one; 27 healthy controls alongside cardiac patients in the other) measuring acute physiological markers, downgraded for imprecision and for indirectness to longer-term outcomes. The studies differed in comparator (oro-nasal versus exclusively oral breathing) and duration (60 versus 5 minutes), so only the shared direction, slower breathing with nasal-only breathing, is drawn from both.

Vegan note

No diet-specific angle; the practice involves no food or supplement.

Safety note

Discomfort was rated marginally higher with nasal-only breathing in one study, and in the other two older healthy participants with a blocked nose had to stop the nasal-breathing trial after 3 minutes.

Sources

In a small crossover study of young healthy adults, breathing exclusively through the nose during a maximal cycling test lowered peak oxygen uptake and peak workload compared with normal breathing, because of ventilatory limitation.

No known concerns at usual amountsRisk

Who this is about

young healthy adults during maximal exercise

Details and sources

Practical note

Graded low: one crossover study of 12 adults, consistent with the known limit on nasal airflow at high ventilation, downgraded for imprecision.

Vegan note

No diet-specific angle; the practice involves no food or supplement.

Sources

In healthy adults, humming raised measured nasal nitric oxide about 15-fold compared with quiet exhalation, by improving air exchange with the sinuses; no health effect of this rise has been established.

No known concerns at usual amountsUnclear

Who this is about

healthy adults

Details and sources

Practical note

Graded low for the measurement itself: one experimental study of 10 adults, downgraded for imprecision. Popular claims that humming or nasal breathing improves health through nitric oxide go beyond this evidence, which the authors framed as a question for further study.

Vegan note

No diet-specific angle; the practice involves no food or supplement.

Sources

In a few small, mostly uncontrolled studies, mouth taping during sleep in adults who mouth-breathe and have mild obstructive sleep apnoea was followed by less snoring and fewer breathing pauses, while other studies found no difference; reviews describe the evidence as limited and heterogeneous, so any benefit for people living well with obstructive sleep apnoea is uncertain.

Take care: see the safety noteUnclear

Who this is about

adults who mouth-breathe during sleep and have mild obstructive sleep apnoea

Safety note

Many studies excluded people with nasal obstruction; see the safety claim on mouth taping.

Details and sources

Practical note

Graded very low: about ten studies with 213 participants in total, mostly uncontrolled before-after designs, with inconsistent results. The largest single positive study had 20 participants, lasted one week and used silicone hypoallergenic tape.

Vegan note

No diet-specific angle; the practice involves no food or supplement.

Sources

Reviews of mouth taping report a potentially serious risk of harm when it is practised indiscriminately, including risk of asphyxiation when the nose is blocked; blocked nasal breathing is associated with worse sleep apnoea indicators, and in adults with obstructive sleep apnoea who breathe mainly through the mouth and have obstruction behind the soft palate, closing the mouth reduced airflow.

Caution: see the safety noteRisk

Who this is about

adults with nasal obstruction, heavy mouth breathing during sleep or obstructive sleep apnoea

Safety note

Many mouth-taping studies excluded anyone with nasal obstruction, so its safety in that group is untested. Mouth breathing during sleep can be a route around a blocked nose or upper airway.

Details and sources

Practical note

Graded low: a meta-analysis found experimentally or surgically induced nasal obstruction raised the apnoea-hypopnoea index by about 14 events per hour, and a nonrandomised study of 54 adults found mouth closure worsened airflow in the heaviest mouth-breathers; the mouth-closure study used manual jaw closure rather than tape, so it is indirect.

Vegan note

No diet-specific angle; the practice involves no food or supplement.

Sources