Lactose Intolerance

Alyssa M. Parker, Ronald Ross Watson

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Scopus citations


Lactose is a disaccharide found in dairy products and breast milk. It is broken down in the small intestine in a reaction catalyzed by the lactase enzyme. Lactose intolerance is a condition in which there is either insufficient lactase levels, hypolactasia, or a complete absence of lactase, alactasia. The three types of lactose intolerance are congenital, primary late onset, and secondary. These conditions can be diagnosed by a variety of tests, including a hydrogen breath test, genetic testing, and a small intestinal biopsy. Lactose intolerance can be treated by a strict lactose-free diet, a low-lactose diet, lactase supplements, or probiotic supplements. The appropriate treatment is selected based on the type of lactose intolerance.

Original languageEnglish (US)
Title of host publicationNutrients in Dairy and their Implications for Health and Disease
Number of pages7
ISBN (Electronic)9780128097625
ISBN (Print)9780128097632
StatePublished - Jan 1 2017


  • Alactasia
  • Hypolactasia
  • Lactase
  • Lactose
  • Lactose intolerance
  • Primary late onset hypolactasia

ASJC Scopus subject areas

  • General Health Professions
  • General Medicine


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