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the claim

Yawning is caused by a lack of oxygen in the blood.

the verdict
REFUTED
the evidence says no
Recorded sources
1 source for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Yawning is caused by a lack of oxygen in the blood?

No. A Cleveland Clinic reference states researchers discarded the oxygen theory because a controlled lack of oxygen does not produce more yawning than usual, and a scoping review notes there is no consensus on yawning's function. A 1913 popular article asserting yawning ventilates the lungs is the only item leaning toward the claim.

Verdict: REFUTED · 1 source for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 1
YAWNING VENTILATES YOUR LUNGS. (Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 29 October 1913)
1913
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YAWNING VENTILATES YOUR LUNGS. (Rodney and Otamatea Times, Waitemata and Kaipara Gazette, 29 October 1913). (1913). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/ROTWKG19131029.2.56

Evidence against · 4
Yawning and airway physiology: a scoping review and novel hypothesis.
2022
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CJ, D. & JA, R. (2022). Yawning and airway physiology: a scoping review and novel hypothesis.. doi.org. https://doi.org/10.1007/s11325-022-02565-7

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More against · 3
The science of yawning: Exploring its physiology, evolutionary role, and behavioral impact -
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The science of yawning: Exploring its physiology, evolutionary role, and behavioral impact - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.4103/jfmpc.jfmpc_1677_24

Yawning Definition & Causes
Get citation
Yawning Definition & Causes. (n.d.). my.clevelandclinic.org. https://my.clevelandclinic.org/health/body/yawning

Fetal yawning.
2010
Get citation
Walusinski, O. (2010). Fetal yawning.. doi.org. https://doi.org/10.1159/000307075

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