The amount of water we should drink throughout the day is an important health topic, as staying properly hydrated is associated with numerous health benefits. However, there is no single answer that fits everyone, since factors such as gender, body weight, physical activity, overall health, and environmental temperature all influence our daily fluid requirements.

As a general guideline, you have probably heard that adults should consume around 2–2.5 liters of fluids per day. This amount includes not only drinking water but also the water obtained from foods and beverages, and it should be adjusted according to each person's individual needs.

In this article, you'll learn how to estimate your daily water intake more practically, how much water you should drink based on your body weight, and which signs indicate that your body is properly hydrated.

Why Should We Drink Water? The Most Important Benefits for the Body

Hydration is a simple daily habit with a significant impact on overall health.

Beyond keeping the body hydrated, water plays a vital role in its proper functioning by:

• Regulating body temperature.
• Transporting nutrients and oxygen throughout the body.
• Supporting digestion and normal bowel function.
• Helping remove waste products through the kidneys.
• Supporting both physical and mental performance.
• Contributing to the health of the skin, joints, and body tissues.

Did You Know?

Water is the body's most essential nutrient, making up approximately 50–70% of total body weight. It is indispensable for maintaining health and well-being, as it is involved in nearly every vital function of the human body.

How Much Water Should I Drink Per Day on Average?

According to the European Food Safety Authority (EFSA), one of the most reliable authorities for nutritional recommendations in Europe, the total daily water intake (including water, coffee, tea, cold beverages, foods, and other sources) for the average healthy adult is:

• Women: approximately 2.0 L/day
• Men: approximately 2.5 L/day

These recommendations refer to total water intake from all sources.

Ideally, around 20–30% of your daily water intake should come from foods—such as organic fruits and vegetables, yogurt, soups, and other water-rich foods—while the remaining amount should come from beverages.

The table below summarizes the EFSA recommendations for daily fluid intake from beverages according to age and gender.

However, several factors may increase your daily fluid requirements, including the following:

1. High Temperature and Humidity

In hot or humid conditions, your body produces more sweat to regulate its temperature. Therefore, it's important to drink water more frequently and not wait until you feel extremely thirsty.

2. Intense or Prolonged Exercise

When you exercise, your body loses water through sweat and breathing, so you need additional fluids to replace these losses.

The longer and more intense your workout—and the more you sweat—the greater your hydration needs become.

As a general guideline, you can add up to 2.5 extra glasses of water per day if you exercise regularly, and even more if your workout lasts longer than one hour.

3. Fever, Vomiting, or Diarrhea

During episodes of fever, vomiting, or diarrhea, your body loses significantly more fluids and electrolytes.

In these cases, it's recommended to drink small amounts of fluids frequently, while in cases of substantial fluid loss, an oral rehydration solution may be necessary following the advice of a healthcare professional.

4. Pregnancy and Breastfeeding

During pregnancy, water requirements increase to support the body's normal physiological changes and the baby's development.

For this reason, the EFSA recommends approximately 300 mL of additional total water intake per day compared with the needs of a non-pregnant woman.

Similarly, during breastfeeding, because water is lost through breast milk, approximately 700 mL of additional total water per day is recommended compared with women who are not breastfeeding.

5. Increased Fiber Intake

A diet rich in fruits, vegetables, soups, and other water-rich foods contributes significantly to your daily fluid intake.

Fruits and vegetables such as watermelon, melon, cucumber, tomatoes, and oranges contain more than 85–90% water, making them excellent contributors to daily hydration.

On the other hand, when you significantly increase your intake of dietary fiber, it's equally important to increase your fluid intake to support normal bowel function.

Read also: Fruit: How Much Should We Eat Every Day?

How Much Water Should I Drink Based on My Body Weight?

There is no internationally accepted formula that can determine the exact water requirements of every healthy adult based solely on body weight. However, a practical rule of thumb is to estimate your daily fluid needs using 30–35 mL of water per kilogram of body weight.

For example:

• 60 kg → 1.8–2.1 L
• 70 kg → 2.1–2.45 L
• 80 kg → 2.4–2.8 L

Keep in mind that you should increase your fluid intake if you exercise, are exposed to hot weather, or are pregnant or breastfeeding.

Estimated Daily Fluid Intake

The values above are approximate and do not mean that everyone should drink this exact amount of plain water every day. Your daily fluid intake also comes from foods and other beverages, while your actual needs depend on your activity level, climate, and overall health.

How Do I Calculate How Much Water I Need?

The following formula provides a simple starting point for estimating your daily fluid requirements:

Body weight (kg) × 30–35 mL = Estimated daily fluid intake

Example

• A 70 kg adult with a moderate activity level should aim for approximately 2.1–2.5 L of fluids per day (including water, tea, coffee, etc.).
• If that person exercises regularly, sweats heavily, or is exposed to very hot weather, their daily fluid needs may easily increase to 2.8–3.0 L per day.

A practical—though not perfect—way to assess your hydration status is by observing the color of your urine. Pale yellow urine generally indicates adequate hydration, whereas dark-colored urine may suggest that you need to drink more fluids.

However, certain medications, dietary supplements, and foods can also affect urine color, so it should not be used as the only indicator of hydration.

How Much Water Should I Drink to Lose Weight?

If you're wondering how much water you should drink to lose weight, it's important to know that there is no specific amount of water that can directly cause weight loss on its own.

However, proper hydration can support a weight management plan, especially when water replaces sugary or high-calorie beverages.

Research also suggests that drinking water before meals may help increase feelings of fullness in some individuals, although the available evidence is still limited. Some systematic reviews have found potential benefits when increased water intake is incorporated into a comprehensive weight-loss program or when water replaces calorie-containing beverages as part of a balanced diet.

How Much Water Should I Drink to Reduce Cellulite?

If you're wondering whether drinking more water can eliminate cellulite, it's important to understand that no specific amount of water can make cellulite disappear.

Cellulite is influenced by many factors, including:

• Genetics
• Fat distribution
• Hormones
• The structure of connective tissue

Nevertheless, proper hydration helps maintain normal skin hydration and contributes to healthier-looking skin. It should be considered part of a healthy lifestyle rather than a treatment for cellulite.

Tips to Reach Your Daily Hydration Goal

• Start your day with one or two glasses of water.
• Carry a reusable water bottle or bottled water with you.
• Drink a glass of water before each main meal.
• Try to drink water regularly throughout the day. Set reminders on your phone or smartwatch if you tend to forget.
• Eat water-rich fruits and vegetables such as watermelon, melon, oranges, cucumbers, tomatoes, and zucchini.
• Choose unsweetened herbal teas, either hot or cold.
• Add lemon, cucumber, mint, or your favorite fruits to your water for extra flavor.

Read also: Homemade Lemonade with Mint

Did You Know?

During intense or prolonged exercise, or whenever you sweat heavily, you may need electrolytes in addition to plain water to replace the minerals lost through perspiration.

Conclusion: Daily Water Intake

In conclusion, the answer to the question "How much water should I drink?" is not as straightforward as it may seem, and there is no single recommendation that applies to everyone.

General guidelines provide a useful starting point, but the amount of water you need each day should be adjusted according to your lifestyle, environmental conditions, physical activity, and your body's individual needs.

Remember to choose water as your primary beverage, include fruits and vegetables with a high water content in your diet, and spread your fluid intake evenly throughout the day.

With Biologiko Xorio by your side, you can meet your daily hydration needs—whatever they may be.

Penelope Alexandropoulou
Registered Dietitian – Nutritionist

References

1. European Food Safety Authority (EFSA). Scientific Opinion on Dietary Reference Values for Water. EFSA Journal. 2010;8(3):1459.
2. World Health Organization (WHO). Healthy Hydration and Water Intake Recommendations. Available at: www.who.int
3. Institute of Medicine (US). Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. National Academies Press; 2005.
4. American College of Sports Medicine (ACSM). Exercise and Fluid Replacement Position Stand. Medicine & Science in Sports & Exercise. 2007.
5. Muckelbauer R, et al. Association Between Water Consumption and Body Weight Outcomes: A Systematic Review. American Journal of Clinical Nutrition. 2013.
6. Popkin BM, D'Anci KE, Rosenberg IH. Water, Hydration and Health. Nutrition Reviews. 2010;68(8):439–458.