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.

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.

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.

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.