Functions of water in the body
Up to 70% of our body is made up of water – approx. 35% of bones, 85% of the brain, up to 90% of the liver and blood are water. The loss of fluid in the body is much more dangerous than a lack of food. A person can survive without water only a few days, but without food for much longer. Even a single day that we spend without a sip of water, is reflected in our performance, fatigue and moral state. Water is a very important basic material for living cells, because cell components – nucleus, mitochondria, various enzymes, etc., “float” within their cell membranes. The so-called intracellular matrix is also composed primarily of water.
Water promotes the absorption of nutrients, carries nutrients to cells, dissolves and eliminates excess products of metabolism, moistens the air we breathe, it helps regulate body temperature through evaporation of perspiration, facilitates joint flexibility, and creates a flexible protective coating around our vital organs.
If a middle-aged adult weighing 60 kg requires about 30 ml of water per 1 kg of body weight, a child weighing 10 kg needs 100 ml and an infant weighing 5 kg needs up to 150 ml of drinking water per 1 kg of body weight. A child’s body is also sensitive to the influence of the harmful elements contained in water. It is a mistake not to replenish fluids until you feel thirsty, as it is already too late from a physiological point of view.
One of the most important functions of water in the body is its involvement in food digestion and nutrient supply to cells. It was found that for example to digest 100 g of meat one needs at least 80 ml of water. If a person drinks that amount at a particular time prior to a meal, it ensures a normal level of digestion. Without this, normal absorption of amino acids from protein-containing food is not possible. To digest fatty food a person needs even more water. A lack of water during the digestion of food means that the water must be taken from the body itself, which leads to the rupture and thickening of blood. This is the reason why nutrition specialists recommend everyone who really cares about their health to drink some pure water before meals, which will then maintain the normal acid-alkaline balance in the body and balanced state of water and salt. You will also do your body a great favour by starting your day off with a glass of plain warm water. Pure warm water pushes food into the lower part of the stomach, quenches thirst, flushes out salt, and cleanses the digestive tract and kidneys.
Water is not and should not be our main source of minerals. Every nutrition specialist advises not to “salt” your food too much. Water with low mineralisation effectively corrects the drinking regimen, because it does not burden the body, it tastes mild, and thus we manage to drink more water. Thanks to the fine composition of water, a person drinks an optimum amount until thirst regresses biologically and not until the moment a person feels full. Especially in the case of children, it is advisable to choose lighter water so that children can manage to drink a sufficient amount without burdening their bodies.