| http://www.w3.org/ns/prov#value | - can turn menstrual cycles on or off.'' The brain says no to producing the hormones needed for ovulation, Dr. Frisch says, because ''underweight women do not have the relative fatness necessary to have a viable infant.'' An Impossible Goal Psychologists who treat eating disorders, especially the binge-and-purge syndrome bulimia, report that they often grow out of futile attempts to diet down to som
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