Nurses know that water is essential to human life – a person can survive for about three weeks with no food, but will perish after only about a week with no water. An adult body, after all, is about 60% water. And yet, most Americans are mildly dehydrated, according to Harvard researchers. You’re continually losing water through your breath, perspiration, elimination, etc. Adequate fluid intake helps make you healthier in so many ways, by nourishing absolutely every cell in your body.

How do you know if you’re running low on vital fluids? Here are three warning signs:

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