Definition

Water is a combination of hydrogen and oxygen. It is the basis for the fluids of the body.

Alternative Names

Diet - water; H2O

Function

Water makes up more than two-thirds of the weight of the human body. Without water, humans would die in a few days. All the cells and organs need water to function.

Water serves as a lubricant and is the basis of saliva and the fluids surrounding the joints. Water regulates the body temperature through perspiration. It also helps prevent and alleviate constipation by moving food through the intestinal tract.

Food Sources

Some of the water in our body is obtained through foods we eat (those that are 85 - 95% water) and some is the by-product of metabolism. But drinking water is our main, and best, source of water.

We also obtain water through liquid foods and beverages, such as soup, milk, and juices. Alcoholic beverages and beverages containing caffeine (such as coffee, tea, and colas) are not the best choices because they have a diuretic (water-excreting) effect.

Side Effects

If adequate water is not consumed on a daily basis the body fluids will be out of balance, causing dehydration. When dehydration is severe, it can be life-threatening.

Recommendations

Six to eight 8-ounce glasses of water are recommended on a daily basis. For example, if you weigh 140 pounds, you will need to drink 70 ounces of water.

Lots More Information:
•Sweating
•Constipation
Review Date:9/2/2005
Reviewed By: William McGee, M.D., M.H.A., Assistant Professor of Medicine and Surgery, Tufts University School of Medicine, Boston, MA, and Director ICU Quality Improvement, Critical Care Division, Baystate Medical Center, Springfield, MA. Review provided by VeriMed Healthcare Network.