Water is of major importance to all living things; in some organisms, up to 90% of their body weight comes from water. Up to 60% of the human adult body is water.
According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
Each day humans must consume a certain amount of water to survive. Of course, this varies according to age and gender, and also by where someone lives.
Water serves a number of essential functions to keep us all going:
A vital nutrient to the life of every cell, acts first as a building material.
It regulates our internal body temperature by sweating and respiration
The carbohydrates and proteins that our bodies use as food are metabolized and transported by water in the bloodstream;
It assists in flushing waste mainly through urination
acts as a shock absorber for brain, spinal cord, and fetus
According to Dr. Jeffrey Utz, Neuroscience, pediatrics, Allegheny University, different people have different percentages of their bodies made up of water. Babies have the most, being born at about 78%. By one year of age, that amount drops to about 65%. In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than men, so they have about 55% of their bodies made of water. Thus:
Babies and kids have more water (as a percentage) than adults.
Women have less water than men (as a percentage).
People with more fatty tissue have less water than people with less fatty tissue (as a percentage).
More than half your body weight is water. Animals and plants on Earth are mostly water. All life in our universe also needs water. When scientists search for life on exoplanets they only look for planets with water; No water no life. However the Quran spoke about this 1400 years before humans had discovered this fact.
Below you will see verses from the Holy Quran. These verses were revealed by God Almighty to his Messenger (peace be upon him) in an Arabian Desert. At a time where water was scarce.
Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe?
God has created every [living] creature from water. And of them are those that move on their bellies, and of them are those that walk on two legs, and of them are those that walk on four. God creates what He wills. Indeed, God is over all things competent.
And it is He who has created from water [i.e., semen] a human being and made him [a relative by] lineage and marriage. And ever is your Lord competent [concerning creation].