Solène Leroux 6:26 p.m., May 19, 2022

It can be still, sparkling, mineral or spring... It's water!

We know that we must drink several liters of water a day, but do we know why it is necessary for our health?

Guest of "Bienfait pour vous", Professor Gilbert Deray, head of the nephrology department at Pitié-Salpêtrière, answered several questions.

It's something we all do every day: stay hydrated.


Bienfait pour vous

Thursday, Julia Vignali and Mélanie Gomez return to the water, an essential health gesture.

Our whole body, our organs need it to function well.

Are you choosing it correctly?

Are there any precautions to take, things to avoid?

Answers with Gilbert Deray, head of the nephrology department at Pitié-Salpêtrière.

>> Find all the programs of Mélanie Gomez and Julia Vignali from 11 a.m. to 12:30 p.m. on Europe 1 in replay and podcast here

How much water for an adult?

"We are mainly made of water", recalls Professor Gilbert Deray.

Our body is composed of 65% water in adults, and for infants, it is even 80%.

"We are neither a camel nor a dromedary, so we have no reservations," he explains.

"We need about 2.5 liters a day, of which one liter comes through food."

Hydration can't go through sodas

“Sodas are even a disaster,” insists the head of the nephrology department at Pitié-Salpêtrière.

“It has been clearly shown that if you only drink diet soda, your risk of obesity and diabetes explodes,” he persists.

According to him, we should even “ban sodas”.

Some have to drink more than others

Starting with those who play sports, says the specialist.

"You can lose up to a liter of water through your skin if it's very hot," he continues.

There are two main situations where you need to drink more.

The first is "if you have urinary tract infections, where you need your bladder washed out with water."

The second is "when you have stones in the kidneys, renal colic".


 Health, planet, budget... Why tap water should be preferred to bottled water

Bien répartir son hydratation

"You have to distribute the volume of drinks", specifies Gilbert Deray, who recommends drinking morning, noon and evening.

"If you have a period of several hours where you don't drink, that's when you'll have complications," such as the one named above.

During illnesses, Professor Deray insists: you must drink throughout the day, with particular attention to hydration before going to bed to "wash" your interior well.

Is there a difference between tap water and bottled water?

For Professor Deray, there are several.

"Bottled water will cost you 100 to 300 times more," explains the specialist.

"It's usually in a plastic bottle. We're talking about tens and tens of billions of plastic bottles that will be dumped on the planet," he continues.

"Plastic is the pollutant that will kill our planet in the years to come."

Does it have a health or medical use?

"None", insists Gilbert Deray.