Directly in the form of free liquid (different beverages or liquid food), the average adult consumes daily about 1-2 liters of water. The rest is water, ingested in the form of solid food. Even the "dry" food for 50-60% of water. Demand for water lies in a person on a subconscious level. The signal of thirst to the brain 15-20 minutes after drinking, when the body has time to get enough moisture. Reducing the amount of water in the body by only 1.5% is very thirsty, feeling unwell, drowsiness, slow movements, nausea, and sometimes redness of the skin. If the body moisture content is reduced by 6-10%, it is fraught with headaches, shortness of breath, lack of salivation, loss of ability to move and a violation of logical thinking. 11-20% shortage of water causes muscle spasms, delirium, blunting hearing and vision.
And when they lose 25% of the water dies. Under normal circumstances the human body adapts to the environment, and water balance is maintained as a "self-evident." Roughly speaking, he wanted to drink – drank. "Failures" in this scheme possible with a sharp change of temperature (for example, going to the bath), or with an increase in physical activity (eg, sports). In addition, the change needs of the body in the water affect the temperature and humidity, consumption of coffee and alcohol, body condition (eg, illness), for women this factor may be breast-feeding, etc. In the hottest time of year is very important to follow the correct drinking regime. In the morning you can drink some more water in the body to create a supply of fluid, and a day at the height of the heat, drinking should be limited. It is very important to properly maintain the water balance of those involved in sports. Doctors recommend do it this way. 2-3 hours before exercise should drink 400-600 ml of water during exercise to compensate for loss of fluid in the body – every 15-20 minutes 150-350 ml of water after a workout – 150% of the weight loss for during training.