"The body is approximately two thirds water, and losing some of it throughout the day in sweat, tears, and urine is totally normal. That lost water can be easily replaced by sipping on some good ol’ H2O or other drinks (sorry — not the alcoholic kind!) and many foods. But when the amount of water drops too low for normal body functions (like maintaining temperature, protecting organs, and getting rid of all the bad stuff in the body through urination, perspiration, and… other things), it can lead to dehydration. Especially as summer approaches, it’s essential to be on the lookout for the common signs of dehydration (or what’s medically referred to as “volume depletion”)" - Shevonne from Bookmarklet