Cited by 390Digestive system and related healthGastrointestinal motility and disordersMicrobial Metabolites in Food Biotechnology

Update on lactose malabsorption and intolerance: pathogenesis, diagnosis and clinical management

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Misselwitz, Benjamin, Butter, Matthias, Verbeke, Kristin, Fox, Mark R·2019·Gut

Abstract

Lactose is the main source of calories in milk, an essential nutriedigestion, patients with visceral hypersensitivity nt in infancy and a key part of the diet in populations that maintain the ability to digest this disaccharide in adulthood. Lactase deficiency (LD) is the failure to express the enzyme that hydrolyses lactose into galactose and glucose in the small intestine. The genetic mechanism of lactase persistence in adult Caucasians is mediated by a single C→T nucleotide polymorphism at the LCTbo -13'910 locus on chromosome-2. Lactose malabsorption (LM) refers to any cause of failure to digest and/or absorb lactose in the small intestine. This includes primary genetic and also secondary LD due to infection or other conditions that affect the mucosal integrity of the small bowel. Lactose intolerance (LI) is defined as the onset of abdominal symptoms such as abdominal pain, bloating and diarrhoea after lactose ingestion by an individual with LM. The likelihood of LI depends on the lactose dose, lactase expression and the intestinal microbiome. Independent of lactose digestion, patients with visceral hypersensitivity associated with anxiety or the Irritable Bowel Syndrome (IBS) are at increased risk of the condition. Diagnostic investigations available to diagnose LM and LI include genetic, endoscopic and physiological tests. The association between self-reported LI, objective findings and clinical outcome of dietary intervention is variable. Treatment of LI can include low-lactose diet, lactase supplementation and, potentially, colonic adaptation by prebiotics. The clinical outcome of these treatments is modest, because lactose is just one of a number of poorly absorbed carbohydrates which can cause symptoms by similar mechanisms.

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Crossref · 10.1136/gutjnl-2019-318404

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  • Lactose intolerance results from reduced lactase activity and causes diarrhea, abdominal distension, and flatulence; symptoms relate to the amount consumed and usually occur above 12 g lactose.

    “Lactose intolerance is due to decreased lactase activity, resulting in symptoms such as diarrhea, abdominal distension, and flatulence.The intensity of symptoms is related to the amount of lactose consumed, 57 and gastrointestinal symptoms typically occur when consuming amounts exceeding 12 g of lactose.58”

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  1. [73]Hammer HF, Hammer J, Fox M Mistakes in the management of carbohydrate intolerance and how to avoid them. UEG Education 2019; 19: 9– 14.

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Authors
Misselwitz, B., Butter, M., Verbeke, K., & Fox, M. R.
Affiliations
  • University Hospital of Bern (CH)
  • University Hospital Zurich (CH)
  • KU Leuven (BE)
Corresponding author
Fox, Mark R
Venue
Gut
Publisher
BMJ
Published
2019-08-19
Volume
68
Issue
11
Pages
2080-2091
ISSN
  • 0017-5749 (ISSN-L)
  • 1468-3288
OpenAlex
W2969489093
Cited by
390
References
95
Citations by year
2026: 50 · 2025: 58 · 2024: 60 · 2023: 57 · 2022: 62 · 2021: 63 · 2020: 36 · 2019: 3
FWCI
5.43
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Gut (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by-nc)
  • Lirias (KU Leuven) (submittedVersion, cc-by-nc)
  • Bern Open Repository and Information System (University of Bern) (submittedVersion, cc-by-nc)
  • HighWire Press Open Archive (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by-nc)
  • Zurich Open Repository and Archive (University of Zurich)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Digestive system and related health
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Health Sciences › Nursing › Nutrition and Dietetics › Microbial Metabolites in Food Biotechnology
Keywords
lactose malabsorption, lactose intolerance, lactase deficiency, lactase persistence, secondary lactase deficiency, visceral hypersensitivity, irritable bowel syndrome, gut microbiota, lactose digestion, dietary intervention, prebiotics, abdominal symptoms
MeSH terms
Humans, Lactose Intolerance, Malabsorption Syndromes

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