Lactose intolerance
Inability to digest lactose, a component of milk and most other dairy products. Lactose is sometimes also used as an ingredient in other foods, so those with a lactase deficiency should check labels carefully. The basis for this condition is lack of an enzyme called lactase in the small intestine. Lactase is essential to digest lactose. Without enough lactase, there is lactose intolerance. Most people are born with the ability to make adequate amounts of lactase, but lactase production normally decreases with age, more so in some persons than others. There are significant differences relative to lactase production among ethnic groups. Inadequate lactase production can cause difficulty digesting lactose-containing products, which include dairy products themselves and foods containing dairy products as ingredients. The most common symptoms of lactase deficiency are diarrhea, bloating, and gas. The diagnosis may be made by a trial of a lactose-free diet or by special testing. In some cases, other diseases of the intestine may need to be excluded by further medical evaluation.

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a disaccharide intolerance specific for lactose, usually due to an inherited deficiency of lactase activity in the intestinal mucosa; see also lactase deficiency.

Medical dictionary. 2011.

Look at other dictionaries:

  • Lactose intolerance — Classification and external resources Lactose (disaccharide of β D galactose β D glucose) is normally split by lactase. ICD 10 …   Wikipedia

  • lactose intolerance — lac tose in*tol er*ance (l[a^]k t[=o]s [i^]n*t[o^]l [ e]r*ans), n. A physiological condition in which lactose cannot be hydrolyzed in the intestine, leading to uncomfortable gaseousness, cramps, or diarrhea after eating a lactose containing food… …   The Collaborative International Dictionary of English

  • lactose intolerance — noun congenital disorder consisting of an inability to digest milk and milk products; absence or deficiency of lactase results in an inability to hydrolyze lactose • Syn: ↑lactase deficiency, ↑milk intolerance • Hypernyms: ↑genetic disease,… …   Useful english dictionary

  • lactose intolerance — noun Inability to fully metabolize lactose. See Also: lactose intolerant …   Wiktionary

  • lactose intolerance — The inability to digest or absorb lactose, a type of sugar found in milk and other dairy products …   English dictionary of cancer terms

  • lactose intolerance — inability or difficulty digesting milk sugar (characterized by symptoms such as cramping, diarrhea, etc. following the consumption of dairy products) …   English contemporary dictionary

  • lactose intolerance syndrome — lactose intolerance syndrome. См. синдром Дуранда Холзела. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • congenital lactose intolerance — lactose intolerance present at birth, due to deficiency of lactase activity; see lactase deficiency …   Medical dictionary

  • Intolerance au lactose — Intolérance au lactose La digestion du lactose qui ne se fait pas chez les personnes intolérantes. L’intolérance au lactose est l’incapacité à digérer le lactose (sucre de lait) à cause de l’absence ou de la quantité insuffisante d’enzymes… …   Wikipédia en Français

  • Intolérance Au Lactose — La digestion du lactose qui ne se fait pas chez les personnes intolérantes. L’intolérance au lactose est l’incapacité à digérer le lactose (sucre de lait) à cause de l’absence ou de la quantité insuffisante d’enzymes digestives. Somma …   Wikipédia en Français

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