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the claim

Lactose intolerance causes constipation as well as diarrhea.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 5 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 lactose intolerance causes constipation as well as diarrhea?

Partly. One 2022 narrative review states that in approximately 30% of cases constipation can be a symptom of lactose intolerance, and a small infant study reports constipation in 13.33% of lactose-intolerant children. Other sources list diarrhea but not constipation among typical symptoms, so the evidence only partially covers the claim.

Verdict: CONTESTED PARTIAL · 2 sources for, 5 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 · 2
Can Lactose Intolerance Be a Cause of Constipation? A Narrative Review
2022
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Leszkowicz, J., Plata-Nazar, K., & Szlagatys-Sidorkiewicz, A. (2022). Can Lactose Intolerance Be a Cause of Constipation? A Narrative Review. doi.org. https://doi.org/10.3390/nu14091785

2 recorded entries grouped as this source

Additional records of the same source are shown below. They are not counted as additional sources.

Can Lactose Intolerance Be a Cause of Constipation? A Narrative Review -
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Can Lactose Intolerance Be a Cause of Constipation? A Narrative Review - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.3390/nu14091785

Evidence against · 5
Lactose intolerance
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Lactose intolerance. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Lactose_intolerance

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More for · 1
P11 Secondary lactose intolerance and cow’s milk protein allergy in infants
2019
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P11 Secondary lactose intolerance and cow’s milk protein allergy in infants. (2019). doi.org. https://doi.org/10.1136/archdischild-2019-epa.367

More against · 4
Lactose intolerance - NHSNHS
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Lactose intolerance - NHSNHS. (n.d.). nhs.uk. https://www.nhs.uk/conditions/lactose-intolerance/

The interplay between malnutrition, persistent diarrhea, lactose intolerance, and food associated gut dysbiosis in children; a comprehensive review.
2026
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S, K., MT, S., A, A., T, K., Sidrah, H, S., A, H., & AE, E. (2026). The interplay between malnutrition, persistent diarrhea, lactose intolerance, and food associated gut dysbiosis in children; a comprehensive review.. doi.org. https://doi.org/10.1186/s12887-026-06529-8

ANALYSIS OF LACTOSE INTOLERANCE IN STUDENTS WITH SUGGESTIVE SYMPTOMS OF IRRITABLE BOWEL SYNDROME.
2019
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Silva, C. d. J., Leite, I. D. S., Rodrigues, J. W., Almeida, S. P. d., Nóbrega, B. P., & Filho, J. D. R. S. (2019). ANALYSIS OF LACTOSE INTOLERANCE IN STUDENTS WITH SUGGESTIVE SYMPTOMS OF IRRITABLE BOWEL SYNDROME.. doi.org. https://doi.org/10.1590/S0004-2803.201900000-57

Lactose intolerance: An update on its pathogenesis, diagnosis, and treatment.
2021
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Catanzaro, R., Sciuto, M., & Marotta, F. (2021). Lactose intolerance: An update on its pathogenesis, diagnosis, and treatment.. doi.org. https://doi.org/10.1016/j.nutres.2021.02.003

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