Encyclopedia: Lactose Intolerance
Lactose intolerance is the inability to metabolize lactose, a sugar found in milk and other dairy products, because the required enzyme lactase is absent or its availability is lowered. It is estimated that 70% of adult humans are lactose intolerant. Disaccharides cannot be absorbed through the wall of the small intestine into the bloodstream, so in the absence of lactase, lactose present in ingested dairy products remains uncleaved and passes...
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