The popular recommendation to drink 2 liters of water per day has long been criticized by the scientific community.
This blanket figure does not take into account key individual factors and can be misleading.
The modern approach to hydration is based on personalized calculations and understanding of the body's physiological signals.
How much water to drink per day
Basic fluid requirements can be calculated using a formula accepted by many nutritionists and doctors: 30-35 ml of water per 1 kg of body weight.
For example, with a weight of 70 kg the norm will be 2.1 – 2.45 liters, with a weight of 90 kg – 2.7 – 3.15 liters per day.
This figure is a starting point to which individual adjustments must be made.
Factors influencing water demand
- Physical activity: Add 300-500 ml (0.3-0.5 L) for every hour of intense exercise to compensate for sweat losses.
- Climate and air temperature: in hot weather or in rooms with dry air, the need increases. In the cold season it may decrease.
- Health status: increased need occurs with fever, diarrhea, urolithiasis. For some heart or kidney diseases, the drinking regime, on the contrary, is limited (as directed by a doctor).
- Pregnancy and breastfeeding: during these periods the rate increases.
What is included in normal fluid intake?
The key misconception is to only consider clean water.
The total volume of liquid includes all water drunk, as well as liquid dishes, drinks (tea, coffee, juices, milk) and water contained in vegetables, fruits, and berries.
Modern research refutes the myth about the strong dehydrating effect of coffee and tea. When consumed in moderation, they contribute to hydration.
Is it possible to “overdrink”?
Excessive water consumption (more than 4-5 liters in a short period) can lead to hyponatremia – a dangerous decrease in sodium levels in the blood, which causes swelling of cells. This is especially dangerous for the kidneys and brain. Therefore, you need to drink not through force, but focusing on the signals of the body.
Drinking regime
- Focus on thirst. This is a natural and accurate signal from the body that should not be ignored.
- Watch the color of your urine. It should be light straw color. A dark color is a sign of a lack of fluid, completely transparent is a possible excess.
- Distribute the drink evenly throughout the day, taking a few sips every 30-60 minutes, rather than drinking the daily amount in 2 times.
- Particular attention to children and the elderly. Their thirst may be dulled, so it is important to offer water regularly.
There is no ideal water requirement for everyone. A personalized calculation (30-35 ml/kg of weight) taking into account activity, climate and health status is a much more accurate and safe guideline than the mythical “2 liters per day”.
Trust your body, quench your thirst in a timely manner and remember that fluid does not only come from a glass of water.
Important: This information is not a substitute for consulting a doctor. The body's response to changes in diet/training may depend on individual physiology, genetic predisposition and health status. It is recommended to consult a specialist.
