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'''Lactose intolerance''' is a condition wherein an individual cannot digest [[lactose]], a [[sugar]] found in [[milk]].  When a lactose intolerant individual ingests any form of milk, he or she may experience extreme stomach discomfort as well as other symptoms such as cramping and bloating. Such individuals do not produce an [[enzyme]] called [[lactase]] that breaks down lactose after weaning.<ref>http://digestive.niddk.nih.gov/ddiseases/pubs/lactoseintolerance/</ref>

'''Lactose intolerance''' is a condition wherein an individual cannot digest [[lactose]], a [[sugar]] found in [[milk]].  When a lactose intolerant individual ingests any form of milk, he or she may experience extreme stomach discomfort as well as other symptoms such as cramping and bloating. Such individuals do not produce an [[enzyme]] called [[lactase]] that breaks down lactose after weaning.<ref>http://digestive.niddk.nih.gov/ddiseases/pubs/lactoseintolerance/</ref>

The proportion of lactose intolerant individuals varies by region on the planet.  99% of [[China|Chinese]] are lactose intolerant, whereas only 10% of [[United States|Americans]] are.  Recent research indicates that lactose intolerance is high where [[cow]]s were not domesticated. <ref>http://evolution.berkeley.edu/evolibrary/news/070401_lactose</ref>At higher latitudes, lactose intolerance decreases.  As average temperature increases, lactose intolerance increases.<ref>http://www.sciencedaily.com/releases/2005/06/050602012109.htm</ref>

The proportion of lactose intolerant individuals varies by region on the planet.  99% of [[China|Chinese]] are lactose intolerant, whereas only 10% of [[United States|Americans]] are.  Recent research indicates that lactose intolerance is high where [[cow]]s were not domesticated. <ref>http://evolution.berkeley.edu/evolibrary/news/070401_lactose</ref>At higher latitudes, lactose intolerance decreases.  As average temperature increases, lactose intolerance increases.<ref>http://www.sciencedaily.com/releases/2005/06/050602012109.htm</ref>