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It's a good idea to feed a cold but a bad idea to starve a fever, since your body needs nutrition at all times for healing. When your temperature goes up, so does your metabolism—which means your body requires calories more than ever to carry out basic functions like breathing and pumping blood. Not eating will only make it harder for your body to fight off the illness.
Excerpted from:
Medical Myths that Can Kill You—And the 101 Truths That Will Save, Extend, and Improve Your Life by Nancy Snyderman, M.D., © 2009, Crown.