As experts claim, the human body consists of more than 2/3 of its weight in water. Water participates in all processes occurring in our body, from molecular to the functioning of all internal organs and systems. And losing just 10% of it threatens the life activities of our body.

In calculating the daily water balance, dietitians start from the average daily water need of the body, which is 35–40 ml per 1 kg of body weight. That means, in normal weather (not in the heat), the average need for an adult is 2–2.5 liters/day (usually, we consume 1–1.5 liters in the form of free liquid, 1–1.5 from food products). The calculation formula is simple: multiply 35 ml of water by your body weight in kg - and you will know how much water you need to drink throughout the day. For example, if your body weight is 65 kg. Multiply 35 ml by 65 kg - you get 2.27 liters. That means a person weighing 65 kg should drink just over 2 liters of water throughout the day.

But is this average, albeit scientifically justified, daily water norm enough for the body in the hot summer? Of course not..

Our cunning body also starts to change with the onset of heat. Firstly, the metabolism becomes different. Therefore, it requires much more water than at other times of the year. Additional liquid is necessary to maintain normal body temperature.