DRINK PLENTY OF WATER EACH DAY
Tuesday, August 31, 2010
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In the body water is an essential constituent for the maintenance of life, and is also to present in greater quantities. Its presence is essential for the conduct of all physiological processes and biochemical reactions in our body. In addition, the water enters the structure of various substances and acts as a solvent for most nutrients (minerals, water soluble vitamins, amino acids, glucose, etc..) playing an essential role in digestion, absorption, transport and use of the same nutrients. Water is also the means by which the body eliminate metabolic waste, and is essential for the regulation of body temperature. In addition, water acts as a "lubricant" and has functions of cushion in the joints and tissues, maintains the compact and elastic skin and mucous membranes (whose function depends on a proper degree of hydration) and guarantees the right consistency of content intestine. Since in practice there is no system in the body that does not depend directly from the water, it is easy to see that maintaining a proper balance of our "water balance" (ratio of "revenue" and "outputs" of water) is critical to maintain a good state of health in the short, medium and long term. Like all the chemicals that make up our bodies, water is lost and consumed continuously, and must be continually replenished from the outside. The principal means by which the body keeps the water balance are the thirst mechanism (which regulates the amount of water ingestion) and the reabsorption of water in the kidneys (which regulates the amount of water excreted in the urine). The thirst mechanism does have a delayed response time, and often occurs only when the loss of water is already likely to produce the first negative effects. In addition, sometimes (particularly in elderly individuals), the thirst mechanism is malfunctioning, and then many people may not adequately and promptly replace water losses. The water requirement for adults and older is approximately 1 ml of water per kilocalorie food introduced later in the day. For children who are at increased risk of dehydration, the need is greater, and corresponds to approximately 1.5 ml / kcal / day. The water contains no calories, and any short-term variation in body weight due to increased loss or increased water retention is temporary and deceptive. Therefore, an attempt to reduce weight through water rationing is absolutely useless, besides being dangerous to our health.
Under normal conditions the daily losses of water in the adult is around 3-4% of body weight (2-2.5 liters). It is however important to note that these losses are much higher than what the individual is young, with a peak in the first months of life, during which the daily losses of water reach 15% of body weight. Therefore, children are another population group at particular risk of dehydration, if not we will reinstate the water properly and promptly lost.
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