Ashley and Sarah are good friends, and both are students at the same high school. Ashley is concerned about Sarah, who eats indiscriminately. Whenever they talk, the conversation usually turns into a discussion of food and weight maintenance. Sarah seems to know the calorie count and number of fat grams of every food that she and Ashley eat. Recently, Ashley was surprised to see Sarah happily eat an entire box of chocolates at one time. Ashley and Sarah go to the gym to work out three to four times a week. However, Sarah has now started working out every day, and often twice a day. Sarah always grumbles to Ashley about how fat she looks. Ashley thinks that Sarah has lost a lot of weight, but finds it hard to tell because Sarah is usually wearing a baggy sweat suit even on hot days. Whenever they go out to eat, Sarah rushes to the bathroom after eating. Ashley can often hear water running. She has noticed marks that look like bite marks on Sarah's knuckles, and she saw a bottle of laxatives in her friend’s locker. Ashley is very worried, because Sarah even fainted in class on a recent day.