Modern nutritionists recommend that you adhere to the basic rule of nutrition and a healthy lifestyle - drink 2 liters of water per day. This is how many glasses you need to drink, you wonder? Where did such a norm come from, and is it necessary to observe it in all severity, rooting yourself for every unfinished glass?
2 liters of water - how many glasses?
To begin with, we will answer the main question: 2 liters of water is 8 glasses. The calculation is a regular faceted glass filled to the brim. In dietetics, this norm of water consumption is called the “rule of 8 glasses”, but no one knows for sure the root causes of its appearance.
Where did the “8 glasses rule" come from?
Once the question “2 liters of water - how many glasses?” Interested an eminent neurologist from the USA named Heinz Valtin. He was interested in this norm, and he decided to conduct a series of studies confirming the "rule of 8 glasses."
He concluded that such a recommendation came about as a result of a scientific misunderstanding. As far back as World War II, the US government department responsible for nutrition recommended drinking water to absorb kilocalories. The calculation was made as follows: the daily norm of kilocalories is about 1900 kcal, for every kilocalorie there should be at least 1 ml of water, so we get almost 2 liters every day.
But then many factors were not taken into account, which ultimately should make adjustments to the norm of water consumption.
Each has its own norm.
It turns out that the norm can be strictly individual and depend on the following points:
- Climatic conditions - if the weather is too hot, the body gets rid of more fluid in the form of sweat.
- The food regimen and the drinks consumed - half the daily norm of moisture can be obtained from food, while tea or coffee have a diuretic effect and contribute to dehydration.
- Lifestyle - when playing sports or heavy physical exertion, the body loses more moisture. It is also known that the body of a nursing mother loses 1.5 times more water and calories per day than the body of an ordinary person.
The rule of glasses today is beginning to melt day by day, because it is clear that the fragile girl from the office needs less water than an athlete or a loader. But can a baby overpower at least one glass?
How to understand that water is not enough?
In 2004, the same department admitted its long-standing mistake and published new data - it is recommended that a person drink much more than 2 liters of water daily. This is how many glasses you need to drink, you ask? It doesn't matter at all!
Not a single unfinished glass affects anything at all, you need to drink as much water as you want. There are studies that prove that a healthy person, without unnecessary efforts, consumes the necessary rate of fluid for himself along with food and drinks. Therefore, you do not need to know how much water is in a glass. It is recommended that you do not forget to replenish the moisture reserves in hot weather and under power loads, in order to prevent dehydration. And it's best to just drink it when you feel like it.