Un estudio de ‘Science’ dismonta la creencia de tener que beber ocho vases de agua a day-NIUS

  • It is based on the renewal of water that every human being needs and it goes from 6 liters daily

  • Babies are the ones who replace the most water a day, almost 28% of the total water in their body

  • Men need more water than women and sportsmen more than sedentary people

Adiós a los 2 liters and eight glasses of water every day al día The scientists don’t recommend it. A new study conducted with thousands of people reveals that not everyone in the world has the same need to consume the same amount of water, and that it also changes throughout life. The report published in the magazine ‘Science’, pone fin a la creencia tan repetida de los ocho vases.

“The science has never supported the idea of ​​the eight vessels as an adequate guideline, even if only because it confuses the total volume of water with the drinking water, while a large part of the water comes from the foods that are consumedprecisa Dale Schoeller, professor emeritus of nutritional sciences at the University of Wisconsin-Madison (United States), who spent decades studying water and metabolism.

The study has measured the amount of water that people actually consume a day – the rotation of water inside and outside the body – and the main factors that drive it.

Cada uno que beba lo que necessita

Los resultados no indican nuevas pautas. They better reflect that there are a set of physical, atmospheric and genetic conditions that make us drink more or less. El estudio midió la renovación de agua de más de: 5,600 people from 26 countries, con edades comprendidas entre los 8 y los 96 años, y found que había medias diarias desde un 1 liter per day up to 6 liters per day. “También hay valores atípicos que: facturan hasta 10 litros al día”, added Schoeller, coauthor of the studio.

The new investigation objectively measured the time it took for the water to circulate through the body of the participants in the study following the rotation of the “labeled water”. The subjects of the study bebieron una candidad medida de agua que contenía isótopos de hydrogeno y oxygen rastreables. Isotopes are atoms of the same element that have slightly different atomic weights, which makes them distinguishable from other atoms of the same element in a sample.

“If you measure the speed at which a person eliminates these stable isotopes through the urine in the course of a week, the hydrogen isotope can be indicated how much water is being replaced and the elimination of oxygen isotopes can indicate how many calories are burning“, says Schoeller, whose laboratory at UW-Madison was the first to apply the labeled water method to study people in the 1980s.

Los bebés son los que más agua renewevan

Más de: 90 researchers participated in the study, directed by a group that includes Yosuke Yamada, former postdoctoral researcher at UW-Madison in the Schoeller laboratory and current head of section at the National Institute of Biomedical Innovation, Health and Nutrition of Japan, and John Speakman, professor of zoology at the University of Aberdeen (United Kingdom). Collected and analyzed the data of the participants, comparing the environmental factors -como la temperature, humidity and altitude de las ciudades de origen de los participants- con las mediciones de la renewal del agua, el: energy expenditure, body mass, sex, age and sportsman condition. They also incorporated the Human Development Index of the United Nations, a composite measure of a country that combines life expectancy, schooling and economic factors.

The volume of water renewal reached its peak in men in the study during 20 years, while women maintained a plateau from 20 to 55 years. Los recien nacidos, sin embargo, son los que más agua renewevan daily, sustituyendo alrededor del 28% del agua de su cuerpo.

Physical activity is one of the keys

The level of physical activity and sport status explain most of the differences in water renewal, followed by sex, the Human Development Index and age.

En igualdad de condiciones, l:os hombres y las mujeres differ in approximately half a liter of water renewal. As a reference, the results of the study predict that a 20-year-old non-athlete man (but with an average physical activity) who weighs 70 kilos and lives at sea level in a developed country with an average air temperature of 10 grados C and una humedad relativa del 50%, ingiere y pierde unos 3.2 litros de agua al día. A woman of the same age and level of activity, with a weight of 60 kilos and who lives in the same place, will spend 2.7 liters.

The researchers discovered that: if the energy used by a person is duplicated, his daily consumption of water will increase approximately one liter. Fifty kilos plus corporal weight add 0.7 liters a day. A 50% increase in humidity increases water consumption by 0.3 liters. Los deportistas use approximately one liter more than non-deportistas.

Doble de esfuerzo supone un litro más de agua diario

The researchers discovered that “the hunter-gatherers, the mixed farmers and the subsistence farmers” had a greater rotation of water than the people who live in industrialized economies. In short, the lower your country’s Human Development Index is, the more water you spend per day.

Agricultores y ganaderos de países pobres are the ones who spend the most water a day

“This represents a combination of several factors,” Schoeller emphasizes. “Un edificio con climatización durante el día. Eso, sumado a que es menos probabiles que tengan acceso a un sorbo de agua limpia siempre que necesiten, hace que su rotation de agua sea major”.

The water, the new gold

According to Schoeller, the measurements will improve our ability to predict more specific and precise future water needs, especially in extreme circumstances, and how much better we prepare for long-term needs and even to warn short-term health problems. , creen los researchers.

“Determining how much water humans consume is increasingly important due to population growth and increasing climate change – points out Yamada–. Given that water renewal is related to other important health indicators, such as physical activity y el percentage de grasa corporal, tiene potencial como biomarcador de la salud metabólica”.


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