Marissa is an avid marathon runner, and she trains incessantly. She has slimmed down so that she is now underweight for her height and has very little fat tissue. One would expect Marissa to

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Women who engage in excessive exercise and lose a significant amount of weight may experience amenorrhea, the absence of menstrual periods. This is because their bodies are in a state of energy deficit and may not have enough energy to support reproductive functions.

Marissa Is an Avid Marathon Runner, and She Trains Incessantly