Textbook Problem

After four years of experiencing amenorrhea, Tonya seeks medical care to help her become pregnane. She is convinced that her lack of menstrual periods is the cause of her infertility. Tonya’s height is 5 ft 5 in.; her weight is 107 pounds, which she has maintained for four years (she previously weighed 121 pounds). Her FSH and LH levels are both abnormally low, and she is not ovulating. When the importance and methods of weight gain are explained to her, Tonya agrees to gain some weight. After she regains 7 pounds, her LH level is normal, but her FSH level is still low, and the luteal phase of her cycles is abnormally short. When her weight reaches 119 pounds, Tonya’s LH and FSH levels, ovulation, and menstrual cycles are normal.

What are two likely reasons Tonya was advised to gain weight to improve her chances of conception rather than being given Clomid or another ovulation-inducing drug?