The human body in good health is composed of approximately 50-65 % of water. No other substance in the body, separately the oxygen, has comparable and such an important influence on such many functions different from the body. Water forms part of all the body processes, of the cells of the body, the tissues and the organs. They however is distributed differently according to areas' of the body. For example, the percentage of water in blood, the muscles and the most important organs represents nearly 70 %; on the other hand, the fat contains only very little water, approximately 23 %.

Body water plays among other things a decisive role at the time of the control of the body temperature and the feeding of the cells in nutritive substances: glucose, enzymes, hormones and in oxygen. Moreover, it helps with the evacuation of toxic substances and the metabolic substances of the cells, contributes to sparing the articulations and reinforcing the musculature and hydrates tissues and the skin.

By evacuating sweat and the urine, like while breathing, the man however constantly loses body water throughout the day. The quantity of evacuated water depends among other things factors such as the physical activity, of possible disease, the catch of drugs, of the hormonal modifications, the food and also in particular the respective climatic conditions.

Whereas the man can survive one relatively long period without food without that leading thus obligatorily to serious problem of health, only a few days without a sufficient absorption of liquid can lead to problems of very dangerous health. This is all the more valid as a body water deficit also automatically means rock salt deficiency (for example, out of zinc, copper, selenium, etc). This is why it is extremely important to feed its body of sufficient liquid.

Moreover; Thirst is not the most reliable sign for a malnutrition in liquid! Indeed, thirst appears only when the body already indicates the first appearances of dehydration. The first signs of dehydration’s can be for example tiredness, headache, a lack of capacity of concentration and physical performance, as well as giddiness’s. You should also hold account on this subject of the symptoms such as a dark-colored urine (possibly very odorous), a desire for urinating definitely weak, a dry mouth, dry lips and skin, as well as nausea, even the constipation.

Too low body water values do not indicate however obligatorily a too low consumption of liquid. The absorption of water with laxative food (alcohol, drinks with high percentage of caffeine like the coffee or black tea and some food such as asparagus’s) or of drugs also enters in account of line as causes. In order to compensate for the loss of liquid, an adult individual should consume each day approximately two liters of liquid, best being in the form of water, sugar-free fruit juices, of tea s containing fruit or plants.

It would be however to make a great error believing that, with the inverse, body water values located above the average are inoffensive, or even healthy. It is precisely all the opposite because the values of high body water can be the sign of serious problems of health, for instance a reduced functioning of the kidneys. A reduction of the kidneys, and consequently the less frequent evacuation of urine, can, for the same contribution of liquid, to lead to an accumulation of water in the body. The presence of too much water in tissues requests however the heart and conduit with an increase in the blood pressure; if water accumulates in the lung, a pulmonary edema, very dangerous for the health, can even appear.

One thus judges hardly the importance of body water for the health of each individual, and it is precisely for this reason that you should start as of today regularly controlling your personal percentage of body water.