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Lactose intolerance

Lactose intolerance is the condition in which lactase, an enzyme needed for proper metabolization of lactose (a constituent of milk and other dairy products), is not produced in adulthood.

A hydrogen breath test is required for a clinical diagnosis.

Note:   The above text is excerpted from the Wikipedia article "Lactose intolerance", which has been released under the GNU Free Documentation License.
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May 27, 2017

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