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Lactose intolerance is the inability to digest significant amounts of lactose, the predominate sugar in milk. This inability results from a shortage of the enzyme lactase, which is normally produced by the cells that line the small intestine. Lactase breaks down milk sugar into simpler forms that can then be absorbed into the bloodstream. While not all people deficient in lactase have symptoms, those who do are considered to be lactose intolerant. Common symptoms of lactose intolerance are: nausea, cramps, bloating, gas, diarrhea, which begin about thirty minutes to two hours after eating or drinking foods containing lactose. The severity of symptoms varies depending on the amount of lactose each individual can tolerate.
Some causes of lactose intolerance are well known. For instance certain digestive diseases and injuries to the small intestine can reduce the amount of enzymes produced. In rare cases, children are born without the ability to produce lactase. For most people,......

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Approximate Word Count: 326
Approximate Pages: 2 (250 words per double-spaced page)

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