For one to be diagnosed as bulimic, he or she must average binge(s) per week for at least three months.

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A binge means eating to more than full in a  short matter of time.  Binge eating disorder is a life-threatening, but treatable eating disorder characterized by binges or eating large quantities of food in a quick manner to the point of discomfort. If an individual is averaging 2 binges per week for at least three months, he can be considered as bulimic.  

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a- all cells come from pre-existing cells