Water is one of the most essential substances for life. It makes up about 60% of the human body's mass and is involved in almost every physiological process, from transporting oxygen to cells to regulating body temperature. But how much water should you actually drink each day—and can you overdo it?
How much is “enough”?
In many countries, the general recommendation is to consume about 2 liters of water per day for women and 2.5 liters for men. Important: this does not only include drinking water, but all the liquid from food and drinks. For example, watermelon contains over 90% water and should also be included in your daily diet.
However, scientists say that the exact amount of water you need is individual. It depends on your age, body weight, level of physical activity, the climate you live in, and your health.
According to Professor John Speakman from the University of Aberdeen, a study of more than 5,000 people in 23 countries found that the average requirement for men is around 1.8 litres of water per day, and for women 1.5-1.6 litres. In old age it is even lower, around 1 litre.
What happens when there is a water shortage?
Our bodies are constantly losing fluids—through breathing, urination, and sweating. If we don't replace these losses, we become dehydrated.
Symptoms:
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dark urine with a strong odor,
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infrequent urination,
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dry mouth, sunken eyes,
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fatigue, headache,
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dizziness.
In severe cases, confusion, rapid heartbeat, and even organ failure are possible.
Is it possible to drink too much?
Yes, and it can be deadly. Too much water can cause hyponatremia (water intoxication), where sodium levels in the blood drop critically low. Cells begin to swell, including those in the brain.
Symptoms:
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nausea, vomiting,
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headache, muscle spasms,
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drowsiness, irritability,
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convulsions, loss of consciousness.
An example is the story of Joanna Perry, who drank too much water at the London Marathon. She made it to the finish line, but collapsed at home and spent three days in intensive care.
How do you understand how much water you need?
The body has natural signals — thirst and the color of urine. Pale yellow is normal, dark yellow is a signal to drink more.
It is also worth drinking more if you have vomiting, diarrhea, or intense physical exertion.
Conclusion: Balance is the key to health. Water is a vital nutrient, but it should be consumed in moderation.
