We know that water is essential for our health, but it is sometimes difficult to know how much is necessary. In this article, we will give you all the information you need to know how much water you should drink based on your profile.
1. Why is hydration essential?
Water is a fundamental element of your body, representing about 60% of your body weight. It plays a vital role in many physiological and physical functions. Water helps regulate body temperature through perspiration, transports nutrients, and helps your body eliminate toxins with the help of the kidneys, which filter metabolic waste.
Insufficient hydration can cause several symptoms that are important to recognize: an intense feeling of thirst, dry mouth and lips, dark and scant urine, unusual fatigue, frequent headaches, as well as dizziness or concentration problems can be signs of dehydration.
It is essential to drink regularly throughout the day, even in the absence of thirst! Adequate hydration will promote better energy, better digestion, and proper body function.
2. How much water should you drink every day?
2.1 General recommendations
According to the EFSA (European Food Safety Authority), daily water intake — including both water in drinks and that provided by food — is estimated at 2.5 liters per day for an adult man and 2 liters for an adult woman. On average, 80% of these needs are covered by drinks, i.e., 1.6 to 2 liters to drink per day, and about 20% by food, mainly through fruits and vegetables.
These needs vary according to several factors: ambient temperature, level of physical activity, health status (fever, diarrhea, etc.), or physiology (pregnancy, breastfeeding). The WHO emphasizes that water losses can reach 1 to 2 liters per hour in case of intense physical exercise or heatwave, which justifies an adaptation of water intake with, if necessary, additional electrolyte intake.
It is therefore recommended to drink regularly throughout the day, even in the absence of thirst, in order to cover these variable needs and maintain a good water balance.
2.2 According to specific profiles
Children have specific needs according to their age. An infant is mainly hydrated by breast milk or formula, while an older child must learn to drink regularly, even in the absence of thirst. Their bodies being more sensitive to dehydration, it is important to offer them water frequently. By the way, did you know that 61% of children and adolescents don't drink enough water daily?
As for adults, they have needs that vary by gender. On average, a man should consume more water than a woman due to a larger muscle mass and a higher metabolism. EFSA recommendations for a man are 2 liters of water per day and 1.6 liters of water for women.
Seniors must be particularly vigilant, as the sensation of thirst decreases with age. Insufficient water consumption can lead to problems such as fatigue, confusion, or a higher risk of urinary tract infections. To prevent dehydration, it is recommended that older people drink regularly.
Pregnant women must adapt their hydration during pregnancy. Water is essential for fetal development and the proper functioning of maternal metabolism. Good hydration also helps limit certain minor problems such as constipation, cramps, or water retention.
Athletes must increase their water consumption due to fluid loss related to perspiration, between 0.5 liters of water and up to 2.5 liters (sometimes even more!). It is recommended to drink before, during, and after exercise to prevent dehydration and to maintain good physical performance.
During a heatwave, water needs increase significantly. As perspiration is more intense, it is essential to drink more to compensate for losses and avoid the risk of heat stroke.
For weight loss, water plays an important role in satiety and weight management. Good hydration helps regulate appetite and promotes better digestion. Drinking a glass of water before a meal can help reduce feelings of hunger and limit snacking.
3. What are the dangers of drinking too much or too little?
3.1 Risks of insufficient consumption
Insufficient water intake leads to different levels of dehydration.
Mild dehydration can manifest as thirst, unusual fatigue, headaches, and decreased concentration.
Moderate dehydration causes dry skin and mucous membranes, dark and scant urine, and an accelerated heart rate.
Severe dehydration is a medical emergency and can lead to mental confusion, low blood pressure, severe dizziness, or even loss of consciousness.
In the most severe cases and for chronic dehydration, it can cause kidney or cardiovascular complications.
3.2 Risks of excessive consumption
While hydration is essential for health, it is also important not to overdo it. Excessive water consumption, especially over a short period, can lead to an electrolyte imbalance in the body, particularly hyponatremia.
Hyponatremia occurs when the sodium concentration in the blood becomes abnormally low, often due to excessive dilution linked to overly rapid water absorption. This imbalance can cause symptoms such as nausea, headaches, muscle cramps, mental confusion, and in the most severe cases, cerebral edema. This type of situation remains rare and mainly concerns extreme contexts, such as endurance competitions where large amounts of water are consumed without adequate sodium intake.
In a healthy person, the kidneys can eliminate up to 0.7 to 1 liter of water per hour, but beyond that, the elimination capacity is exceeded. This is why it is recommended to adapt one's water consumption to one's real needs, without excess or restriction, and taking into account the climate, physical activity, or diet.
In certain more specific cases, behaviors related to psychological or eating disorders can lead to chronic overconsumption of water, called psychogenic polydipsia. This phenomenon remains rare, however, and must be managed by a health professional.
In summary, excess water is uncommon but can present a real risk when not compensated by a balanced electrolyte intake. It is therefore preferable to drink regularly, listening to your body's signals, and to favor hydration adapted to your needs and activity.
4. How to hydrate well daily?
4.1 The best sources of hydration
The main source of hydration remains water, of course, whether it comes from the tap or bottles. In addition, certain foods and drinks can also effectively contribute to your daily water intake.
Indeed, tap water is a practical, economical, and ecological solution. It is subject to strict controls to guarantee its potability. However, its composition can vary depending on the region, particularly in calcium or chlorine, which can influence its taste or digestive tolerance in some sensitive people.
Bottled waters are divided into two main categories. Spring waters, lightly mineralized, which are suitable for daily consumption, and natural mineral waters, which contain specific minerals (calcium, magnesium, bicarbonates, etc.) and can meet particular needs. It is advisable to alternate brands and types of water to avoid a prolonged excess of a particular mineral.
Hot drinks such as tea, infusions, or herbal teas also contribute to hydration. They are a calorie-free alternative for those who find it difficult to drink pure water. Be careful, however, with caffeinated drinks (like coffee or sodas), which can have a slight diuretic effect in high doses and should not replace water in your daily hydration.
Fruit juices, although rich in water, also contain a significant amount of sugar. To limit their glycemic impact while benefiting from their water content, it is preferable to dilute them with water.
Finally, fresh fruits and vegetables represent on average 20 to 30% of total hydration. The richest in water are cucumber, lettuce, zucchini, watermelon, melon, tomato, orange, and strawberry. In addition to their water content, they are an excellent source of vitamins, potassium, and antioxidants.
4.2 Tips to remember to drink
To avoid forgetting, several solutions exist, such as mobile applications that allow you to schedule regular reminders to remember to drink throughout the day. For example, you have Hydro Coach which allows you to define your hydration goals.
Adopting small habits also facilitates hydration, such as always having a water bottle close at hand. This encourages drinking without thinking about it!
Then, a good alternative for those who find it difficult to drink pure water is flavored water with pieces of fruit, mint leaves, or lemon.
Hydratis tablets contain electrolytes that will help your body assimilate the water you consume. Different flavors are offered to adapt to everyone's tastes. The tablets are therefore an excellent solution for you to have effective and faster hydration.
Frequently Asked Questions (FAQ)
- Is it good to drink 3 liters of water per day?
Drinking 3 liters of water per day can be adapted for athletes or in case of high heat, but it is not necessary for everyone. Excessive consumption can cause hyponatremia.
- What is the right amount of water to avoid tiring the kidneys?
Kidneys function well with 1.6 to 2 liters per day. Drinking too little promotes kidney stones, while unnecessary excess can overload them. Nevertheless, if you have kidney problems, we recommend consulting a doctor.
- How do you know if you're drinking too much water?
Signs include very clear and frequent urine, bloating, nausea, and, in severe cases, confusion due to low sodium levels.
Hydration is crucial for your body's proper functioning. Drinking 1.6 to 2 liters of water per day helps regulate body temperature, eliminate toxins, and maintain fluid balance. Insufficient or excessive consumption poses health risks, such as dehydration or hyponatremia.
Various sources of hydration include tap water, mineral water, infusions, and fruits. To remember to drink, simple tips such as using a water bottle or setting reminders via apps can be very useful. Remember, the key is to maintain a good fluid balance to preserve your health!
Bibliography
Wong, J. M. W., Ebbeling, C. B., Robinson, L., Feldman, H. A., & Ludwig, D. S. (2017). Effects of Advice to Drink 8 Cups of Water per Day in Adolescents With Overweight or Obesity. In JAMA Pediatrics (Vol. 171, Issue 5, p. e170012). American Medical Association (AMA). https://doi.org/10.1001/jamapediatrics.2017.0012
Arnaud, M. J., & Noakes, T. D. (2011). Should humans be encouraged to drink water to excess? In European Journal of Clinical Nutrition (Vol. 65, Issue 7, pp. 875–876). Springer Science and Business Media LLC. https://doi.org/10.1038/ejcn.2011.40
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