How much water do you really need? Debunking myths about body hydration

Did you know that drinking large amounts of water doesn’t always mean good body hydration? Although it’s been repeated for years that “the more you drink, the better,” science shows that the matter is much more complex – and electrolytes, not just fluids, play a key role. Water is the foundation of life for all of us, but our fluid needs vary, and therefore the answer to the question of how much water to drink daily can differ for each of us. Let’s look at the scientific facts and find out what the symptoms of dehydration are despite drinking water, and which electrolyte supplements are worth reaching for.

How much water to drink daily? Actual fluid needs

Not everyone needs the identical amount of water every day. Expert recommendations, published by the Institute of Food and Nutrition, emphasize checking our individual fluid needs. This depends on many factors, such as body weight, physical activity, ambient temperature, or health status.

The simplest equation recommends drinking 30-35 ml of water per kilogram of body weight. Thus, a person weighing 70 kg should drink approximately 2.1-2.45 liters of fluids daily. However, this is an approximate starting point, not a strict norm, as needs can increase depending on daily living conditions and situations. Fluid needs increase during heavy physical work, fever, vomiting, diarrhea, high-protein diets, or diets high in fiber or sodium, as well as during heatwaves. At the same time, it should be remembered that fluids come not only from pure water but also from tea, coffee, soups, vegetables, and fruits.

There is no single, rigid value that determines how much water to drink daily. This value should be adjusted individually, taking into account one’s own needs, lifestyle, and current conditions. Every body is different, which is why it’s so important to observe yourself and respond to the signals sent by your body to ensure optimal hydration. Especially since symptoms of dehydration despite drinking water may indicate electrolyte imbalance or insufficient replenishment of key minerals necessary for proper body function.

Body hydration: electrolytes and myths about them

Many myths have grown around drinking water and body hydration, which often mislead us and cause us to harm our own health. Below you will find debunked myths that are not worth believing.

• Everyone must drink “8 glasses of WATER a day” – false. This popular recommendation is a significant simplification and does not apply to everyone. All fluids consumed and ingested with food count in the daily balance. Additionally, the body’s requirements change dynamically. Instead of rigidly adhering to 8 glasses, it’s worth observing your needs and responding to your body’s signals.
• “Flavored waters with electrolytes effectively hydrate” – false. Waters advertised as “with electrolytes” most often contain too little of them to genuinely compensate for deficiencies. Their main purpose is often an attractive taste, not always a beneficial composition – it’s worth reading labels and opting for reliably formulated products when medically or individually indicated.
• “It’s worth adding salt to every water to hydrate the body” – false. Adding salt to water should not be a routine way to hydrate. Although sodium is one of the electrolytes lost through sweating, its losses are usually small, even with increased physical activity. Adding salt to beverages every time can cause negative effects, such as increased blood pressure. Electrolyte supplementation should be tailored to individual needs, preferably after consultation with a specialist.
• Electrolytes are only needed in summer” – false. Although increased sweating and heat increase the demand for electrolytes, their deficiencies can occur throughout the year – also during infections, gastrointestinal diseases, when using certain medications, or during pregnancy and breastfeeding.

Body hydration: electrolytes – what you need to know?

Body hydration is not just about water itself. Electrolytes such as sodium, potassium, magnesium, calcium, and chloride also play a significant role in proper hydration.

Water helps ensure body hydration, while electrolytes are responsible for maintaining this hydration and the proper balance of mineral compounds in bodily fluids. It is electrolytes that are responsible for the proper functioning of muscles, the nervous system, the heart, and regulate the acid-base balance.

Moreover, electrolytes also maintain hydration during physical exertion – water alone, without electrolytes, can be insufficient, especially with excessive sweating or heat.

Electrolytes support proper body hydration by:

• maintaining appropriate osmotic pressure,
• transmitting nerve impulses,
• proper muscle contraction,
• regulating hormone secretion and kidney function.

Symptoms of dehydration despite drinking water – how to recognize them?

One of the frequently repeated myths is the belief that simply drinking water regularly is enough to prevent dehydration. However, sometimes we experience symptoms of dehydration despite drinking water – this most often happens if we don’t supply electrolytes or if there’s excessive loss of them (e.g., through sweating, vomiting, diarrhea, intense physical exertion).

The most common symptoms of dehydration despite drinking water are:

• headaches and dizziness,
• chronic fatigue,
• muscle tremors,
• cramps,
• dry mouth and eyes,
• dark urine,
• decreased skin elasticity,
• apathy.

In the absence of electrolytes, problems such as moments of concentration loss, heart rhythm disturbances, and even fainting can occur. This is why electrolyte supplementation is gaining importance, especially for athletes and physically active individuals.

Electrolyte supplementation – when and for whom?

Electrolyte supplementation is recommended for individuals who are exposed to increased loss or insufficient dietary intake of them. Such individuals often include:

• individuals training intensively,
• those working physically in the heat,
• those experiencing chronic diarrhea or vomiting,
• those exposed to prolonged stress or heavy sweating,
• convalescents.

Electrolyte supplementation not only helps maintain a proper water balance but also hydrates the body more effectively than water alone. Products such as in the form of sachets or effervescent tablets provide not only essential minerals but also support performance, regeneration, and mental concentration.

Fluid needs in different age and physiological groups

Children – fluid needs in children are higher per kilogram of body weight than in adults. This is due to more intense metabolism, a higher proportion of water in the body, and the immaturity of mechanisms regulating water-electrolyte balance. A recommendation of 100 to 50 ml/kg is made. Sudden fluid losses can be particularly dangerous in the youngest; dehydration quickly leads to a worsening of well-being and requires intensive fluid replenishment, often including electrolytes.

Elderly people – With age, the amount of water in the body decreases, as does the natural mechanism of feeling thirst, which increases the risk of chronic fluid deficiency, hence the importance of prevention and regular fluid intake. In seniors, the risk of dehydration increases due to chronic diseases (e.g., diabetes, kidney failure, dementia) and the use of diuretics and laxatives. Symptoms of dehydration in this group may be non-obvious (dry mouth, low blood pressure, weakness, impaired consciousness).

Athletes – the demand for fluids and electrolytes can increase several-fold depending on:

• intensity and duration of training – sweat losses can exceed 1-2 liters per hour of exertion;
• external conditions – high temperature and air humidity intensify the loss of not only water, but also sodium, potassium, magnesium, and other electrolytes;
• individual tolerance to exertion and body adaptation.

Insufficient hydration and lack of electrolyte replenishment lead to decreased performance, cramps, headaches, and even serious heart rhythm disturbances. In such a case, electrolyte supplementation and choosing appropriate products like BestElectrolytes (sachet) are crucial.

Electrolyte supplements and BestElectrolytes – a solution for active people

BestElectrolytes is a unique dietary supplement available from Best Lab, featuring a comprehensive formula. Its composition of sodium, potassium, magnesium, creatine, and D-ribose supports both physical performance and muscle function, as well as the proper functioning of the nervous system. Regular intake allows for effective and rapid replenishment of electrolyte deficiencies, especially in situations of high demand for fluids and electrolyte-based body hydration.

is a handy form of supplement – easy to dissolve, convenient to use, dedicated to both athletes and mentally active individuals. Thanks to the sachet, it’s possible to quickly prepare an isotonic drink that truly supports electrolyte-based body hydration even in extreme conditions.

BestElectrolytes sachet contains:

• sodium – essential for the body’s water balance,
• potassium – supporting muscle function,
• magnesium – reducing fatigue,
• creatine for increased performance,
• D-ribose, improving energy metabolism.

Body hydration – can you “over-hydrate”?

Yes, excess water without a proper electrolyte balance also causes harm. It can lead to hyponatremia – a dangerous drop in sodium levels, manifested by headaches, nausea, weakness, seizures, and even loss of consciousness. Therefore, it’s always important to remember the balance between water and electrolyte intake – this is where electrolyte supplements and products like help.

Summary: Actual body needs

Maintaining water-electrolyte balance in the body is important for health and well-being. Simply drinking water, without considering individual needs and replenishing electrolytes, is not always sufficient. Therefore, it’s worth taking a holistic view of the body’s actual needs and making conscious decisions about hydration every day.

• The amount of water to drink per day depends on individual needs, and demand increases during heatwaves, physical exertion, and illness.
• Fluids alone are not enough – it’s necessary to ensure the body’s electrolyte hydration, preferably with the support of electrolyte supplements like BestElectrolytes.
• Symptoms of dehydration despite drinking water often signal electrolyte deficiencies, which are essential for proper functioning.

Electrolyte supplementation, including BestElectrolytes, is an effective way to support the body in situations of increased fluid and mineral demand – both during intense activity and extreme weather conditions.

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