Photo: John Diez

Can you go 20 days without water?

REUTERS/Francois Lenoir. Humans need food and water to survive. At least 60% of the adult body is made of water. A human can go without food for about three weeks but would typically only last three to four days without water.

businessinsider.com - Here's how many days a person can survive without water

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A man drinks water near a fountain on a hot summer day in Brussels, Belgium, July 19, 2016. REUTERS/Francois Lenoir

Humans need food and water to survive.

At least 60% of the adult body is made of water.

A human can go without food for about three weeks but would typically only last three to four days without water. We can't live on air and sunshine alone. The human body needs food and water to survive. A human can go for more than three weeks without food — Mahatma Gandhi survived 21 days of complete starvation — but water is a different story. At least 60% of the adult body is made of it and every living cell in the body needs it to keep functioning. Water acts as a lubricant for our joints, regulates our body temperature through sweating and respiration, and helps to flush waste. The maximum time an individual can go without water seems to be a week, an estimate that is based on observations of people at the end of their lives, when food and water intake has been stopped, Randall K. Packer, a professor of biology at George Washington University told Maggie Fox of NBC News in 2013. But one week is a generous estimate. Three to four days would be more typical, especially in difficult conditions like broiling heat. "You can go 100 hours without drinking at an average temperature outdoors," Claude Piantadosi of Duke University told Fox. "If it’s cooler, you can go a little longer. If you are exposed to direct sunlight, it’s less."

The Danger Of Dehydration

As much as 65% of the human body is water. USGS

Our bodies are constantly losing water, which is why drinking a glass of H20 once a day is not enough to keep the body replenished. We lose water when we sweat, go to the bathroom, and even when we exhale. “Under extreme conditions an adult can lose 1 to 1.5 liters of sweat per hour," Packer wrote in 2002 article for Scientific American. "If that lost water is not replaced, the total volume of body fluid can fall quickly and, most dangerously, blood volume may drop." When you have too little blood circulating in your body, blood pressure falls to levels that can be fatal. Body temperatures also rise when we stop sweating. Dehydration that causes "a loss of more than 10% of your body weight is a medical emergency," according to the University of Rochester Medical Center, "and if not reversed can lead to death." We get some water from food, "but drinking water is your main, and best source, of water," according to a website maintained by the US National Institutes of Health. Other beverages like juice or milk also help keep the body hydrated. The only fluid you would want to stay away from is alcohol because it actually causes the body to lose more water than normal through excessive urination.

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The “One Meal a Day” diet, or OMAD diet, claims to help you lose weight by forcing your body to burn fat. It’s a type of intermittent fasting, which alternates between periods throughout the day in which you can eat anything and periods in which you don’t eat at all. OMAD is particularly strict because you don’t eat for 23 hours, then consume all of your calories in a single meal. How It Works Like other kinds of intermittent fasting, eating one meal a day is a way of manipulating how your body finds and uses fuel. When you eat in a more traditional pattern, your energy comes from the food that you eat. When you take in carbohydrates, your body breaks them down into sugars. If you have more sugar in your blood than you need, a chemical called insulin will carry the extra into your fat cells. When you don’t eat for extended periods of time, your body produces less insulin. Your cells still need energy for fuel, so your fat cells release energy to compensate. For this to happen, however, you have to avoid eating for long enough that your insulin levels drop.

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