Lactose Intolerance »
What is lactose intolerance?
Lactose intolerance is an inability to digest and absorb
lactose (the sugar
in milk) that results in gastrointestinal symptoms when milk or products
containing milk are drunk or eaten.
What causes lactose intolerance?
Lactose is a larger sugar that is made up of two smaller sugars, glucose and
galactose. In order for lactose to be absorbed from the intestine and into the
body, it must first be split into glucose and galactose. The glucose and
galactose then are absorbed by the cells lining the small intestine. The enzyme
that splits lactose into glucose and galactose is called lactase, and it is
located on the surface of the cells that line the small intestine.
Lactose intolerance is caused by reduced or absent activity of lactase that
prevents the splitting of lactose (lactase deficiency). Lactase deficiency may
occur for one of three reasons, congenital, secondary or...
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