[[File:Milk Bottle.jpg|thumb|250px|A Dairy Crest Semi-Skimmed Milk Bottle]]
La '''leche''' es un líquido secretado blanco que contiene nutrientes producidos por las glándulas mamarias de hembras de los [[mamíferos]]. It contains nearly all the nutrients necessary to sustain Contiene casi todos los nutrientes necesarios para mantener la [[lifevida]].<ref name=Belitz>{{cite bookcita libro|authorautor=Belitz, H. D; Grosch, W,; Schieberle, P John M|titletítulo=Food Chemistry|yearaño=2009|locationubicación=Berlin Heidelberg|editionedición=4th4ª|publishereditorial=Springer|pagepágina=498|isbn=978-3-540-69933-0}}</ref> It is the main source of nutrition for mammals from the early days of their life until they are able to digest other types of [[food]]. One of the most important ingredients in milk is [[calcium]], responsible for the growth of strong [[bones]] and [[teeth]].
<ref>{{cite book|author=Newton, David E|title=Food Chemistry|publisher=Facts On File, Inc., Infobase Publishing|year=2007|page=57|location=New York|isbn=978-0-8160-5277-6}}</ref>