Scientists Debunk the 8-Glasses-a-Day Rule After Studying 5,600 People in 26 Countries

The largest study ever conducted on human fluid requirements, covering more than 5,600 participants from 26 countries, challenges the widely accepted advice to drink two litres of water daily. Researchers found that actual fluid needs vary significantly based on age, sex, body weight, climate and physical activity levels. The universal "eight glasses a day" rule lacks robust scientific backing, according to the study's findings.

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