water glasses

Do you need to drink eight glasses of water daily?

It is a widely held belief that a person must drink at least eight glasses of water in a day, however, a new study has contradicted this view which says that it might be “too much”.

A recent study, published in Science, found that the recommended eight glasses of water were more than the required amount, BBC reported.

As per the estimates, people only need about 1.5 to 1.8 litres of water as they also intake water from food.

“The original estimate of two litres a day comes from a slight miscalculation,” Professor John Speakman from the University of Aberdeen told BBC.

“The water that we’d need to drink is the difference between the total water that we need to ingest and the amount that we get from our food.

“The way they estimated the amount from food was by asking people how much they eat.”

The scientist said that asking people how much they eat is a common practice to estimate the amount of water intake that comes from food. He, however, said that following this method could result in misestimation as people “under-report” the amount of their food intake.

The study
There have been countless studies to find the correct answer to the question but the surveys applied to small samples of people. However, this new study was conducted through collaboration across the globe, in which the scientists used a stable isotope technique.

The survey involved 5,604 individuals aged between eight days and 96 years old, from 23 different countries. Some of the hydrogen molecules were replaced by a stable isotope of the element called deuterium in a glass of water the participants of the survey consumed.

Deuterium is an element naturally found in the body so the rate of its elimination showed how quickly the water in the body turned over.

It was discovered that people with a higher water turnover generally need to drink more water, while energy expenditure is the biggest factor in water turnover.

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