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Dihydrogen Monoxide.

H2O. Dihydrogen Monoxide is just really fun to say.

The largest percentage of your bodyweight is water. The single most important consumable for a human, water is the thing your body reacts most quickly to or the absence of. You can survive for weeks without food (do not try to survive for weeks without food). You can only survive days without water, and the effects of dehydration are felt within hours.

Water makes your body work, and also comprises 60 percent of it. Your brain and heart are approximately 75 percent water. It’s important stuff. You’ve heard this before, so we just wanted to remind you.

Water is also one of the most overlooked, easy health changes. Your body likes it, if you make a habit of drinking more when you are thirsty, instead of sugary drinks, you can cut a ton of empty calories out of your diet.

Mild to moderate dehydration is likely to cause:

•    Dry, sticky mouth
•    Sleepiness or tiredness — children are likely to be less active than usual
•    Thirst
•    Decreased urine output
•    No wet diapers for three hours for infants
•    Few or no tears when crying
•    Dry skin
•    Headache
•    Constipation
•    Dizziness or lightheadedness

Severe dehydration, a medical emergency, can cause:

•    Extreme thirst
•    Extreme fussiness or sleepiness in infants and children; irritability and confusion in     adults
•    Very dry mouth, skin and mucous membranes
•    Little or no urination — any urine that is produced will be darker than normal
•    Sunken eyes
•    Shriveled and dry skin that lacks elasticity and doesn't "bounce back" when pinched into a fold
•    In infants, sunken fontanels — the soft spots on the top of a baby's head
•    Low blood pressure
•    Rapid heartbeat
•    Rapid breathing
•    No tears when crying
•    Fever
•    In the most serious cases, delirium or unconsciousness