The body’s water needs are appropriate to the person’s morphology and environment. Water makes up around 60% of your body weight. But every day, a considerable amount escapes from the body. Studies show that the body of an average person would spend more than 2 liters of water a day. Excess is mainly eliminated by the urine, which is used to evacuate the waste produced by the organism but also using respiration, sweat, and tears. These losses are compensated by food, which represents around a liter, and liquids that we drink.
It is, therefore, necessary to hydrate during the day, even when feeling thirsty. Indeed, with age, people feel less the need to drink, and risks of dehydration are possible. Just as in high temperatures (heat causes additional water loss), physical effort, breastfeeding, and illness, it is worthwhile to ensure proper hydration of the body. The risk of dehydration is defined according to body weight and may be due to insufficient and prolonged water consumption. The first signs of chronic dehydration can be dark urine, dryness in the mouth and throat, headache and dizziness, as well as dehydrated skin and intolerance to heat.
Drinking too much would be bad for your health
Too much and too fast consumption of fluids in the body, called hyponatremia, could be harmful. In the final, it would not be supported by the kidneys, which can only regulate a liter and a half of water per hour. Drinking too much water instructs the cells in the blood to swell, which could cause brain function problems. The concentration of intra-plasma sodium ion is significantly reduced due to the significant presence of water in the plasma. However, hyponatremia most often results from pathologies such as potomania or an excess of perfusions: cases of this disorder remain rare and concern only a minimal number of people.
Studies have provided to define what would be the real need for water in the body. The figures vary between 1 and 3 liters per day. It is advisable to drink about two liters daily. But as we saw previously, it depends on the morphology, the environment, and the lifestyle of the person. This statement must, therefore, be qualified, and replaced in the contexts to which it belongs. These two liters do not include water in the literal sense of the term, but all the liquids that pass through food and water-based drinks (tea, coffee, juice). The theory of 8 glasses, therefore, designates the totality of liquids consumed during a day. This recommendation originated in a study by the Institute of Medicine, who had suggested that each calorie of food ingested was equal to one milliliter of water. A consumption of 1,900 calories per day is equivalent to 1,900 mL of water (i.e., 1.9 L). The confusion arose when people forgot that the food already contained water: it would therefore not be necessary to drink 2 liters of additional water. However, other studies claim the opposite: according to them, they should consume between 2.5 and 3 liters in addition to food.
The answer then remains vague and impossible to define because many types of research contradict each other, and each gives different results. The recommendation to drink 1.5 liters of water per day can be counted as a myth. Still, it remains necessary to ensure its proper hydration during the day for the ideal of its organism.