Anorexia nervosa is an eating disorder
in which the afflicted individual avoids eating or eats extremely little out of an irrational fear
of becoming or being fat
. This fear/perception of being fat does not diminish as the individual loses weight (often to a dangerous
extent -- some individuals may lose up to 25% of their original weight). This condition is most common among young women (ages 12 to 21) but is also found in men (particularly athlete
s, etc.) and in older women.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.