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Water and Human Body

The water is the most important nutrient and the most abundant substance in the human body.  Water comprises about three quarters of the human mass and is a major component in every cell.  In addition water is important to human health for many reasons; some of them are listed below.


•    Water is needed to separate a phosphate group from adenosine triphosphate (ATP) or guanosine triphosphate (GTP) to get energy, the process is called hydrolysis. The chemical reaction that occurs can be illustrated by the following equations.

•    ATP +H2O = Energy + ADP + Inorganic Phosphate
•    GTP + H2O = Energy + GDP + Inorganic Phosphate

•    The energy that we get from food is used to generate ATP or GTP before its energy can be used by the human body, which makes water crucial to all energy usage by the human body.

•    Water is the containing medium for electrolytes and all other ions throughout the human body. Some of these ions help to form electrical pathways for nerve functions.

•    Being 2% dehydrated can seriously degrade physical and mental functions.

•    Being 15% dehydrated is likely to be lethal.

•    Unlike vitamin deficiencies which can take weeks to make someone ill, a water deficiency can kill in days or even hours.

•    Water is also very important for removing toxins from the human body.  The body has four major ways of removing toxins which are:

o    Bowels
o    Urination
o    Perspiration
o    Processing of toxins by the liver

Water is also important to fitness and fat loss for several reasons including the following:
•    Water fills us up without adding any calories.
•    Dehydration will degrade a person’s ability to exercise and burn calories.
•    Dehydration will reduce protein synthesis which is needed to build or repair muscles.

•    It is normally recommended to drink about 2 to 3 quarts of water per day.  However, this will vary with the size and activity level of the person as well as with the climate conditions.
•    In either case, if your urine is bright yellow, then you need to drink more water.
•    Also, anyone who exercises nonstop for more than 1 hour should consider replacing electrolytes along with the water.  This is to avoid hyponatremia i.e. depleted sodium or other forms of severe electrolyte depletion which can be dangerous.

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