Lactose intolerance classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
There are three major types of lactose intolerance.[1] They are primary lactose intolerance, secondary lactose intolerance and congenital lactase deficiency.
Classification
There are three major types of lactose intolerance:[1]
- Primary lactose intolerance: Environmentally induced by weaning in non dairy consuming societies. In most Asian and African cultures, mother's milk is the only commonly available milk and so milk consumption beyond infancy is not commonplace, therefore children become weaned, which is the same weaning process for all mammals (domesticated and wild). However societies such as the japanese where milk consumption has been on the increase, demonstrate that notwithstanding the genetic predisposition to lactose intolerance, they now present lower prevalence of lactose intolerance.[2] For any given individual the degree of weaning is probably genetically influenced.
- Secondary lactose intolerance: Environmentally induced, resulting from certain gastrointestinal diseases, including exposure to intestinal parasites such as giardia.[3][4] In such cases the production of lactase may be permanently disrupted.[2]
- Congenital lactase deficiency present at birth and diagnosed in early infancy.
References
- ↑ 1.0 1.1 B. Heyman. Lactose Intolerance in Infants, Children, and Adolescents. PEDIATRICS Vol. 118 No. 3 September 2006, pp. 1279-1286 (doi:10.1542/peds.2006-1721)
- ↑ Studies on the etiology of milk intolerance in Japanese adults, Yoshida Y, Sasaki G, Goto S, Yanagiya S, Takashina K, Gastroenterol Jpn.;10(1):29–34, 1975
- ↑ "Intestinal Protozoa" Mark Wiser 2000
- ↑ "Giardiasis" Andre Pennardt February 22, 2006