Mary is a cross-country runner whose coach asked to decrease her total body fat to 7 percent. Will Mary's performance increase at this lower percent body fat? How would you respond to this coach?

What will be an ideal response?


Mary needs at least 12 percent essential fat for normal physiological function. Without it, human health and physical performance deteriorate. This type of fat is found within tissues such as muscles, nerve cells, bone marrow, intestines, heart, liver, and lungs. If Mary decreases her total body fat to 7 percent, she will not have enough essential fat to maintain her normal physiological function and her physical performance as well as health will deteriorate.

Health & Biomechanics

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