December 1, 2023

Nutrition Facts In Lemon

Get The New Nutrition Facts In Lemon

The ‘eight glasses of water a day’ rule isn’t backed by evidence, so how much should we be drinking?

7 min read

Many of us have heard the generic advice telling us to drink eight glasses of water every day, but that figure doesn’t appear to be rooted in any scientific facts. 

That’s according to the authors of a new study, which looked out how much water people around the world drank each day.

And it turns out that there’s no blanket rule for how much water we should all be drinking — how much we need depends on different factors.

Is the eight-glasses-per-day rule bogus?

“The current study clearly indicates that one size does not fit all for drinking water guidelines,” researchers say in the study, published by Science late last month

“The common suggestion that we should drink eight, 8-ounce glasses of water per day [about 2 litres] is not backed up by objective evidence.”

However, we already knew this. In fact, Australia’s water intake guidelines say there’s no one rule that applies to everyone.

Pennie Taylor — a senior research scientist and clinical dietitian for the CSIRO — explains it this way. 

“The study continues to validate and reconfirm what we know about water being essential for survival and that the level of our daily water intake need is dependent on several factors: age, height, weight, general health and environmental factors — weather, altitude and humidity, for example,” Dr Taylor says. 

“We need more fluids if we are unwell, have increased needs for pregnancy and lactation, or have high-exercise levels.

“These needs also increase if the weather is hot and humid.”


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