An adult female having a BMI that is below 18.5, might be an indication that she’s having low body fat, and this means she’s underweight. Several complications could arise as a result of this which include those listed in the options above except for option A. <em>Underweight women do not experience increased frequency of menstrual cycles, rather they do experience irregular menstrual cycles as a result of the low level of fat in their body.</em>