lunes, 5 de abril de 2010

Lactose Intolerance


Lactose Intolerance


On this page:

What is lactose intolerance?
What causes lactose intolerance?
Who is at risk for lactose intolerance?
What are the symptoms of lactose intolerance?
How is lactose intolerance diagnosed?
How is lactose intolerance managed?
What other products contain lactose?
Points to Remember
Hope through Research
For More Information
Acknowledgments

What is lactose intolerance?
Lactose intolerance is the inability or insufficient ability to digest lactose, a sugar found in milk and milk products. Lactose intolerance is caused by a deficiency of the enzyme lactase, which is produced by the cells lining the small intestine. Lactase breaks down lactose into two simpler forms of sugar called glucose and galactose, which are then absorbed into the bloodstream.

Not all people with lactase deficiency have digestive symptoms, but those who do may have lactose intolerance. Most people with lactose intolerance can tolerate some amount of lactose in their diet.

People sometimes confuse lactose intolerance with cow milk allergy. Milk allergy is a reaction by the body’s immune system to one or more milk proteins and can be life threatening when just a small amount of milk or milk product is consumed. Milk allergy most commonly appears in the first year of life, while lactose intolerance occurs more often in adulthood.



What causes lactose intolerance?
The cause of lactose intolerance is best explained by describing how a person develops lactase deficiency.

Primary lactase deficiency develops over time and begins after about age 2 when the body begins to produce less lactase. Most children who have lactase deficiency do not experience symptoms of lactose intolerance until late adolescence or adulthood.

Researchers have identified a possible genetic link to primary lactase deficiency. Some people inherit a gene from their parents that makes it likely they will develop primary lactase deficiency. This discovery may be useful in developing future genetic tests to identify people at risk for lactose intolerance.

Secondary lactase deficiency results from injury to the small intestine that occurs with severe diarrheal illness, celiac disease, Crohn’s disease, or chemotherapy. This type of lactase deficiency can occur at any age but is more common in infancy.


open here to see the full-text:
http://digestive.niddk.nih.gov/ddiseases/pubs/lactoseintolerance/index.htm

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