This question was explored by The Guardian, which consulted Professor Lewis Halsey, an expert in environmental physiology at the University of Roehampton. Surprisingly, his response might disappoint those who are enthusiastic about drinking water in large amounts.
The Exaggeration Around Drinking Water
Professor Halsey emphasizes that the growing concern about drinking enough water may be overblown. He explains:
“While water is undoubtedly essential for survival, our bodies are designed to withstand temporary fluid shortages without severe negative effects, at least in the short to medium term.”
Water is a fundamental component of the human body, accounting for approximately 75% of an infant’s weight and about 55% in older adults. It is crucial for maintaining cellular balance and life itself. But does this mean we must adhere to a specific daily intake?
How Much Water Do We Actually Need?
According to Halsey, water requirements vary from person to person based on several factors, including body size, physical activity, and climate. For example:
- Larger or more active individuals: Typically need more water to compensate for fluid loss.
- Those with low body fat percentages: Whether due to being very slim or having high muscle mass, require more water as muscles contain more water than fat.
- People living in dry climates: Lose more water through breathing compared to others.
- Diet: Foods with high caloric density generally have lower water content, increasing the need for additional hydration.
The Answer Lies in Thirst
Halsey suggests a simple approach:
“Drink when you feel thirsty.”
The only exception applies to older adults, as their sense of thirst diminishes with age, making them more susceptible to chronic dehydration.
Do We Need to Drink Water Constantly Throughout the Day?
Professor Halsey stresses that our bodies can manage intermittent water intake effectively, and there’s no need to drink continuously throughout the day.
Conclusion
There is no universal rule requiring everyone to drink 8 glasses of water daily. Water needs are individual and depend on various factors. Simply let your thirst guide you, while paying special attention to vulnerable groups like the elderly.
