How long can you live without water?

In this short article, we will answer the question “How long can you live without water?” and will discuss what the lack of water can cause to your body.

How long can you live without water?

Human existence depends on water, which makes up around 60% of an adult’s weight, or more than half of our total body weight. 

All of our internal chemical reactions depend on it because it is the most significant component of cells and the most crucial component of the organism.

In addition to being present in all secretions (such as sweat and tears), the blood, the joints, the respiratory, digestive, and neurological systems, the urine, and the skin, water is also necessary for carrying food, oxygen, and mineral salts. 

For instance, 20% of bones are caused by it. We quickly lament the absence of it in the body for all of this. A person can endure for weeks without eating, but three to five days without drinking anything can be fatal. 

How long a person can go without water depends on many factors, including their health, the weather, and how active they are. Dehydration is a risk for the elderly, children, and those with chronic illnesses.

Although there is currently no precise measure of how quickly dehydration would kill a person, it is believed that a person can survive without fluids for anywhere between two days and a week.

An adult can sweat between 1 and 1.5 litres per hour in an extremely hot climate, according to Washington University specialists. A person usually has overheated, or an excessively high internal body temperature, when they are enough dehydrated to become ill.

According to UK National Health Service recommendations from 2009, a person experiences severe dehydration when they lose roughly 10% of their body weight as a result of water loss. 

However, this sort of dehydration can occur considerably more quickly on a hot day with a loss of up to 1.5 litres of water each hour. Experts advise us to consume at least 2.5 litres of fluid per day.

This intake may even reach 6 litres on extremely hot days or when the person engages in vigorous exercise, mostly because sweat “wastes” a lot of fluids in an effort to maintain a healthy body temperature. 

When someone gets thirsty, it’s because they’ve already consumed enough water. We expel water through urination, breathing, skin, coconut, and perspiration, among other bodily functions. Water consumption is therefore crucial throughout the day.

What happens to the body when it lacks water?

The most typical signs of dehydration are dry mouth and thirst. Our body may experience this because it needs to replace missing nutrients. 

However, thirst is not a reliable indicator of the body’s requirement for water. Excessive thirst may be a powerful indicator when combined with other symptoms like decreased urine output or black urine. 

Below are the top 11 signs of dehydration; have a look:

  • Dry mouth, 
  • headache,
  • dry skin, 
  • decreased skin elasticity,
  • deep eyes, 
  • diminished or absent tears,
  • weakness, excessive fatigue, 
  • drop in blood pressure, 
  • increased heart rate
  • sunken mole in newborns.

What types of dehydration are there?

Isotonic, hypertonic, and hypotonic dehydration are all possible. Learn what each one of them consists of:


This type results from blood volume loss following, for instance, vomiting and diarrhoea. The loss of water and mineral salts in the same amount is the main cause. Young children are more prone to having it present.


It is characterised by salt and water loss in the blood and is frequently linked to other medical conditions. Diabetics and children with diarrhoea are more likely to experience it.


It has to do with salt loss and the resulting drop in blood sodium levels. It generally occurs as a result of excessive perspiration or in youngsters who have diarrhoea.

Depending on how many signs and symptoms a person exhibits, dehydration can be categorised as mild, moderate, or severe. The severity of the problem increases with the number of symptoms and signs of dehydration.


In this short article, we answered the question “How long can you live without water?” and discussed what the lack of water can cause to your body.


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