“…Clinical studies report that appetite and eating behavior (Buffenstein et al, 1995;Dye and Blundell, 1997), energy intake (Dalvit, 1981;Lissner et al, 1988;Martini et al, 1994) and energy expenditure vary across the menstrual cycle (Solomon et al, 1982). Food or energy intake (kcal consumed per day) and energy expenditure (kcal per kg of body weight expended per day) usually are higher during the luteal phase, when estradiol levels are moderate and progesterone levels are high, than during the follicular phase, when both estradiol and progesterone levels are low (Dalvit, 1981;Lissner et al, 1988;Li et al, 1999;Pelkman et al, 2001). Eating disorders such as bulimia nervosa may also fluctuate in severity across the menstrual cycle.…”