Editing Hexose (section)

==Natural occurrence and uses==
The aldohexose that is most important in biochemistry is {{sc|D}}-[[glucose]], which is the main "fuel" for metabolism in many living organisms.

The 2-ketohexoses [[psicose]], [[fructose]] and [[tagatose]] occur naturally as the {{sc|D}}-isomers, whereas [[sorbose]] occurs naturally as the {{sc|L}}-isomer.

{{sc|D}}-Sorbose is commonly used in the commercial synthesis of [[Ascorbic acid (molecular aspects)|ascorbic acid.]]<ref name=pub-sorbose /> {{sc|D}}-Tagatose is a rare natural ketohexose that is found in small quantities in food.<ref name=pub-tagatose />  {{sc|D}}-[[Fructose]] is responsible for the sweet taste of many fruits, and is a building block of [[sucrose]], the common sugar.