Why does the body need body fat?

Your body needs some body fat to maintain good health. Fat is the body's primary source of stored energy, and you need at least some energy reserves to get you through tough times -- periods of physical stress such as pregnancy, growth, or an illness that prevents you from taking in sufficient calories. As you grow older and the risk of wasting diseases such as cancer rises, stores of body fat play a role in improving survival through treatment or the course of the disease.

Body fat also plays an important role in the metabolism of some hormones; thus women with too little body fat have low estrogen levels, interfering with fertility and increasing their risk of osteoporosis and fractures.

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