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Why is water so important?
About 60% of our body is water. Water regulates body temperature, carries nutrients to cells, lubricates joints, flushes out toxins through the kidneys and supports digestion. Even mild dehydration (falling short of the water your body needs) can cause fatigue, poor concentration, headaches and increased appetite (mistaking thirst for hunger). Drinking enough water is one of the simplest yet most effective steps for weight management and overall health.
How is daily water intake calculated?
The practical, common method is to work out a set amount of water for each kilogram of body weight. This tool uses a coefficient between 30–40 ml/kg depending on activity level:
Sedentary .......... 30 ml/kg
Lightly active ..... 33 ml/kg
Moderately / very active ... 37 ml/kg
Intense / hot ...... 40 ml/kg
Example: for someone 75 kg and lightly active:
75 × 33 = 2,475 ml ≈ 2.5 litres/day (about 10 glasses). This amount includes water from food and other drinks too.
Method: Fluid guideline per body weight (30–40 ml/kg by activity); based on common clinical and nutrition references.
Practical ways to drink more water
- Start the day with a glass of water and keep a bottle by your bed.
- Make it a habit to drink a glass of water with every meal and snack.
- Carry a refillable bottle with you — water you can see gets drunk more often.
- If you don't like plain water, add lemon, cucumber or mint.
- Use a phone reminder or a water-tracking app.
Frequently asked questions
"8 glasses a day" (about 2 litres) is a handy general rule, but it doesn't fit everyone. Your needs change with your weight, activity, climate and health. A weight-based calculation (ml/kg) gives you an estimate that's better suited to you personally.
Yes. A significant share of your daily fluid comes from food (especially fruit and vegetables) and other drinks. Although tea and coffee are mildly diuretic, their net contribution is positive. Even so, it's healthiest to make plain water your main drink.
The simplest sign is urine colour: pale straw yellow points to good hydration, while dark yellow means you need to drink more. Frequent thirst, a dry mouth and fatigue can also be signs of dehydration.
Indirectly, yes. Drinking water before a meal can boost the feeling of fullness and reduce how many calories you take in; plus, thirst is often mistaken for hunger. Water alone doesn't burn fat, but it supports a healthy nutrition plan.
No, it's only a rough generalisation. Real needs vary from person to person: weight, activity level, air temperature, sweating and diet all play a part. A 90 kg active person and a 50 kg sedentary person can't have the same water needs. This tool calculates water based on your weight and activity, so it's more personal than a fixed number. The simplest sign is urine colour: pale yellow is good, dark yellow means 'drink more water'.
They meet them. Caffeine has a mild diuretic (water-passing) effect, but it isn't strong enough to lose most of the fluid you drink; the net effect is still to add water to your body. So tea, coffee, milk, soup and juicy fruit all count towards your daily fluid goal. Just don't put sugary drinks (fizzy drinks, ready-made fruit juice) in place of water — they give you fluid but bring calories and sugar you don't want along with it.