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A member asked:
Why are some people lactose intolerant and some aren't?
5 doctors weighed in across 2 answers
LACK OF LACTASE: Some people don't have a specific enzyme that brakes down lactose.
Answered 3/25/2014
4.3k views
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Lactase: Lactose intolerance is caused by a lack of an enzyme called lactase. Lactase deficiency can be genetic, or just decrease with age - sometimes it comes on after a viral illness wipes out the remaining lactase.
Answered 5/6/2015
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