Life data

Do you really need “eight glasses of water a day”?

The following is the Do you really need “eight glasses of water a day”? recommended by And this article belongs to the classification: Life data.

As the weather gets hotter and hotter, more and more people begin to “keep water” and follow the Convention of “eight glasses of water a day”, that is, about 2 liters of water. Under normal circumstances, the human body will have automatic adjustment function, not because drinking too much water or too little water will produce too much negative effect, mainly pay attention to replenishing water.

With the coming of summer, schools, gymnasiums and workplaces began to promote and emphasize hydration. These hyped hydration challenges help foster friendship and friendly competition to ensure that we drink mandatory water throughout the day.

But this is not the case. The water demand and intake of individual body mainly depend on how much water people lose. How much water each person needs to drink depends on three factors:

1. Weight. Larger people need more water.

2. Ambient temperature. When it’s hot, people sweat and lose water.

3. Physical activity level. The increase of exercise intensity will increase the loss of sweat.

Therefore, the widely accepted “eight glasses of water a day” does not apply to everyone. It’s still unclear about the “8 × 8 “(8 cups of water per day, 8 ounces per cup) where does the water intake recommendation come from. Perhaps this 2-litre intake threshold comes from a misreading of the original recommendations made by the US Food and nutrition Commission in 1945 and the recommendations made by the European food safety agency in 2017, which states that the recommended amount of water per day includes all beverages plus water contained in food.

This means that the water content of food, especially fresh fruit, soda, juice, soup, milk, coffee, and even beer, contributes to this recommended daily water requirement. The guidelines continue to point out that most of the recommended water levels can be achieved without increasing drinking water.

And it’s important to note that although alcohol has diuretic properties – alcohol acts directly on the kidneys and makes us urinate more – caffeinated beverages, such as tea and coffee, do not increase the loss of water in the urine more than those drinks contain.

Maybe people around you recommend you to drink more water. In fact, it’s unreasonable. Because the overall water balance of the body, or what sports scientists call balance, is very complex, mammals survive by making real-time adjustments in the kidneys. This is what has the final say of our kidneys when it comes to hydration.

In every kidney – we only need one (that is, we are born with a spare for a rainy day) – there is a secret network of aquaporin-2 (AQP-2) channels that respond to a hormone called arginine vasopressin. This is the main body * s anti diuretic hormone. It is secreted by the posterior pituitary gland in response to neural signals from specialized brain sensors that detect subtle changes in water balance. These specialized sensors are called ring organs.

In 40 seconds, the kidney will make molecular adjustments to underdehydration and over dehydration in response to any disruption of the water balance. These adjustments were caused by the mobilization of AQP-2 water channels, with about 12 million cells per collecting duct.

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