How Much Water Do You Really Need?
Water is essential for virtually every bodily function — digestion, circulation, temperature regulation, joint lubrication, and nutrient transport. The amount you need varies significantly based on body size, activity level, climate, and health status.
Water Intake Formula
Base intake = Body weight (kg) × 0.033 litres
Add 0.5L for moderate exercise, 1.0L for intense exercise
Add 0.5–1.0L in hot or humid climates
Add 0.5L for moderate exercise, 1.0L for intense exercise
Add 0.5–1.0L in hot or humid climates
Signs of Dehydration
| Level | % Body Water Loss | Symptoms |
|---|---|---|
| Mild | 1–2% | Thirst, darker urine, slight fatigue |
| Moderate | 3–5% | Headache, reduced concentration, dry mouth |
| Severe | 6–8% | Rapid heartbeat, sunken eyes, confusion |
| Critical | 9–15% | Medical emergency — seek immediate care |
Hydration Tips
- Check urine colour — pale yellow means well hydrated; dark yellow means drink more
- Drink a glass of water first thing every morning
- Set hourly reminders if you forget to drink
- Eat water-rich foods (cucumber, watermelon, oranges) which count toward intake
- In Pakistan's summer heat, needs can increase by 1–2 litres above baseline