Female bodybuilders and women with eating disorders such as anorexia nervosa commonly experience amenorrhea. what does this fact suggest about the relationship between body fat and menstruation? explain.

  This suggests that a certain amount of body fat is necessary for menstrual cycles to occur. The nervous system appears to respond to circulating levels of the adipose tissue hormone leptin; when leptin levels fall below a certain set point, menstruation ceases. Because a woman lacking adequate fat reserves might not be able to have a successful pregnancy, the body prevents pregnancy by shutting down the ovarian cycle, and thus the menstrual cycle. Once sufficient energy reserves become available, the cycles begin again.

b is the best answer for this question.

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