Lactose

Lactose intolerance
Lactose is the sugar found in milk. Normally, the enzyme lactase, present in the small intestine, breaks down lactose into simpler sugars (glucose and galactose) and then enter the bloodstream. When enzyme activity is reduced, lactose is not broken and is transported in the large intestine where it is fermented by bacteria in that part of the body.
This can cause symptoms such as flatulence, intestinal pain and diarrhea. The amount of milk and dairy products so as to produce symptoms of intolerance varies widely. Many people who have low intestinal lactase activity can drink a glass of milk without any problems.
Similarly, the cheeses that are low in lactose, and fermented milk products such as yogurt, are generally well tolerated. Furthermore, the constant introduction of lactose-containing foods in meals induces a progressive adaptation and reduction of the total quantity of lactose ingested in one meal can improve tolerance in susceptible individuals.

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