Changes

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>

Lactose tolerance is determined by a [[recessive]] [[gene]].  Researchers have recently identified a [[DNA]] [[mutation]] that allows people to tolerate milk.<ref>http://www.foodnavigator.com/news/news-ng.asp?id=42796-scientists-identify-lactose</ref>

Lactose tolerance is determined by a [[recessive]] [[gene]].  Researchers have recently identified a [[DNA]] [[mutation]] that allows people to tolerate milk.<ref>http://www.foodnavigator.com/news/news-ng.asp?id=42796-scientists-identify-lactose</ref> Lactose tolerance is often called lactose persistence.

==References==

==References==