We can’t live without water. It’s essential for controlling body temperature, eliminating waste, flushing out toxins, protecting organs, lubricating tissues and joints, delivering oxygen and nutrients to cells, and making minerals and other nutrients absorbable. But are you getting enough? Take our quiz to recognize the signs and causes of dehydration—and find out what you can do to prevent it.
Lack of protein is a problem in developing nations, but in the U.S., teenage girls and the elderly are the ones most likely to fall short.