By the way, doctor: How can I avoid dehydration?

Q. What exactly is dehydration? It put me in the hospital after a mild flulike illness. How can I avoid it in the future?

A. It may come as a surprise, but your body is 50%–60% water. Each of your trillions of cells is about half water, and you also store water outside your cells — in your blood and in the spaces between your cells.

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