As a serious dancer, Petra watches what she eats. She knows that she is underweight, but fears that if she starts eating more, she will get fat. In addition to a preoccupation with food, she has also stopped menstruating. Petra's behaviors suggest that she might be suffering from .

she might be suffering from anorexia nervosa

Explanation: people who suffer from anorexia fear that if they eat more than they feel like is enough that they'll get overwieght, the stopping of her menstruation cycle most likely means she isn't getting the nutrients that she needs to get into her body

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