It is not understood why disturbed menstrual function occurs in as many
as 50% of women with bulimia nervosa who are at normal weight. The authors
measured luteinizing hormone (LH), estradiol, and progesterone in 13 women
with bulimia nervosa who were at normal weight and six normal comparison
subjects. They found that the women with bulimia nervosa were likely to
have abnormal 24-hour luteinizing hormone (LH) secretion if their current
weight was less than 85% of their past high weight.