Amenorrhea is the absence of a menstrual period. There are two categories: primary amenorrhea, where menarche has not occurred by age 16; and secondary amenorrhea, where normal menstruation has ceased for at least three months. In the context of eating disorders, amenorrhea occurs secondary to: low body weight, significant reduction from typical body weight, and/or secondary to restricted eating patterns. Amenorrhea is not considered a sole diagnostic criteria for eating disorders.  Source.

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