How Long Can a Human Go Without Water? The Truth Will Shock You

Water is one of the most important elements that our body needs to survive. Without it, we would not be able to function correctly. Our bodies are made up of 60% water, so it is crucial to stay hydrated to maintain our overall health. But have you ever wondered how long a human can go without water? In this article, we will discuss the science behind dehydration and how long a person can survive without water.

The Science Behind Dehydration

Dehydration occurs when we lose more fluid than we take in. This can happen through sweating, urination, and even breathing. When our body does not have enough water, it affects our blood circulation, and our organs cannot function correctly. Our body tries to compensate by retaining as much water as possible, which is why we may feel thirsty, fatigued, and dizzy when we are dehydrated. If the situation worsens, it can lead to serious complications like kidney failure, seizures, and even death.

What Happens to Our Body Without Water?

Our body needs water to carry out essential functions such as regulating body temperature, removing waste, and carrying nutrients and oxygen throughout the body. Without water, our organs start to shut down, and the cells in our body start to die. Here’s what happens to our body at different stages of dehydration:

Dehydration Level Symptoms Survival Time
Mild (1-2%) Thirst, dry mouth, dark urine 3-4 days
Moderate (3-4%) Dizziness, fatigue, rapid heartbeat 2-3 days
Severe (5-6%) Confusion, weakness, difficulty breathing 1-2 days
Lethal (more than 7%) Coma, organ failure, death Less than 24 hours

The Advantages and Disadvantages of Fasting

Fasting is a popular way to detoxify your body and lose weight. But, can humans survive without water for extended periods? Let’s discuss the advantages and disadvantages of fasting.

Advantages of Fasting

Fasting has some benefits, including weight loss and detoxification, and it also allows your digestive system to rest. When you fast, your body starts to burn stored fat, which can help you lose weight. It also helps to eliminate toxins from your body by giving the organs a break from processing food.

Disadvantages of Fasting

Fasting for extended periods without water is dangerous and can cause severe dehydration. It can lead to complications like kidney failure, seizures, and even death. Fasting can also result in nutrient deficiencies as you are not consuming enough food to meet your nutritional needs. It can also lead to muscle loss and a slower metabolism, which can be counterproductive for weight loss goals.

FAQs About How Long Can a Human Go Without Water

1. Is it possible to survive without water?

No, it is not possible to survive without water. Our body needs water to carry out essential functions, and we need to stay hydrated to maintain our overall health.

2. How much water should a person drink a day?

A person should drink at least eight glasses (64 ounces) of water per day to stay adequately hydrated.

3. Can drinking other beverages substitute for water?

No. Drinking other beverages like soda or alcohol can lead to dehydration as they contain diuretics that can cause you to lose more fluid than you take in.

4. How does age affect dehydration?

As we age, our body’s ability to conserve water decreases, which makes us more susceptible to dehydration.

5. How does exercise affect dehydration?

Exercise can cause us to lose more water through sweat, so it’s essential to drink water before, during, and after physical activity.

6. Can dehydration lead to heat stroke?

Yes. Dehydration can lead to heat exhaustion and heat stroke, which are serious conditions that require medical attention.

7. Can dehydration cause headaches?

Yes. Dehydration can cause headaches due to reduced blood flow to the brain and irritation of the nerves in your head.

8. Can dehydration affect your skin?

Yes. Dehydration can cause your skin to become dry, flaky, and itchy.

9. Can dehydration lead to constipation?

Yes. Dehydration can cause constipation as it makes it harder for waste to pass through your digestive system.

10. Can dehydration cause seizures?

Yes. Severe dehydration can lead to seizures, which are a medical emergency.

11. Can dehydration cause urinary tract infections?

Yes. Dehydration can lead to urinary tract infections as it reduces urine flow and allows bacteria to grow in the bladder.

12. Can dehydration cause muscle cramps?

Yes. Dehydration can cause muscle cramps and spasms as it affects the electrolyte balance in our body.

13. Can drinking too much water be harmful?

Yes. Drinking too much water can lead to hyponatremia, a condition where there is too much water in the body, which can be life-threatening.


Water is essential for our body to function correctly, and dehydration can cause severe complications that can lead to serious health issues or even death. It’s crucial to stay hydrated and drink enough water daily to maintain our overall health. If you experience severe dehydration symptoms, seek medical attention immediately.

Now that you know the science behind dehydration and how long a person can survive without water, it’s time to take action and ensure you are drinking enough water daily. Stay hydrated, stay healthy!


This article is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare providers with any questions you may have regarding a medical condition.

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