There's no end to how dehydration can negatively affect your body. Biological functions require water in order to work, and if there isn't an abundant flow, these processes can be slowed or stopped. Water--along with blood--helps transport key nutrients along the body. Water can also contain certain minerals and vitamins that the body needs. As such, if there is a deficiency in water, then your body will react negatively. Without water to keep muscles hydrated and lubricated, they stiffen and tense, and eventually can form a cramp. Since parts of your body can shut down without water, hydration is crucial.Next