how many litres of water does a human need per day?
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The National Academies of Sciences, Engineering, and Medicine determined that an adequate daily fluid intake is: About 15.5 cups (3.7 liters) of fluids for men. About 11.5 cups (2.7 liters) of fluids a day for women.
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The current average daily water consumption is 340 litres per person, or 900 litres per household.
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Given that evidence is lacking and many factors affect individual hydration needs, drinking a gallon (3.8 liters) of water per day is likely arbitrary and unnecessary — unless your body requires that much water for proper hydration.
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For men, the Institute of Medicine (IOM) recommends a total of 13 cups (about 3 liters) of fluid each day. For women, they suggest 9 cups (a little over 2 liters) of fluid each day.
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According to current estimates, each person consumes approximately 150 litres per day — equating to almost two full bathtubs of water per person per day, or 54,750 litres per person each year. Most of this water is flushed away every day. Showers are one of the biggest consumers of water in households.
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NHS Choices' page on Water and drinks says: Your body needs water or other fluids to work properly and to avoid dehydration. That's why it's important to drink enough fluids. In climates such as the UK's, we should drink about 1.2 litres (six to eight glasses) of fluid every day to stop us getting dehydrated.
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How much water do you need to drink? It seems like an average adult should be drinking about eight 8-ounce glasses of water each day. This means most people should drink about 2 liters or half a gallon of water each day.
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According to current estimates, each person consumes approximately 150 litres per day — equating to almost two full bathtubs of water per person per day, or 54,750 litres per person each year. Most of this water is flushed away every day.
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The Institute of Medicine has estimated that men need approximately 13 cups (3 liters) of fluid daily, and that women need approximately 9 cups (2.2 liters) of fluid daily. Less is more if you have kidney failure (a.k.a. end stage kidney disease).
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So how much should we be drinking to stay hydrated? As a rough guide, adults should aim for 1.5 – 2L (6-8 cups) of fluid each day and children 1 – 1.5L (4-6 cups). This includes all drinks, including those listed below, and water. If you are exercising or playing a lot of sport you will need more.
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2.5 gallons The average person uses 101.5 gallons of water Per day.
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The European Food Safety Authority recommends that women should drink about 1.6 litres of fluid and men should drink about 2.0 litres of fluid per day. That's about eight glasses of 200ml each for a woman, and 10 glasses of 200ml each for a man.
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The more your weigh, the more water you need to drink. For instance, a healthy person, weighing in at 70 kg and measuring 5 feet 10 inches would be required to drink around 2 litres of water each day. Adult men need to drink more water than adult women, but not by much. The difference is roughly around 0.5 litres.
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One study looked at adults who consumed less than 41 oz (1.2 liters) of water per day. When they increased their water intake to 85 oz (2.5 liters) per day, they were happier, had more energy and felt calmer ( 19 ).
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How much water do you need to drink every day? A common recommendation is to drink six or eight 250 mL (8 fl oz) glasses of water or other fluid every day. But some adults may need more or less, depending on how healthy they are, how much they exercise, and how hot and dry the climate is.
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According to Healthline, humans should consume approximately 2 liters daily. A 10-mile day hike is a different story though. Variables like terrain, weather, and pace will dictate how much YOU need to drink... potentially much much more than 2 liters.
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Today, the NAM recommends letting thirst guide your water consumption habits but set an even higher volume of total daily water intake: 3.7 liters (15 cups) for the average adult male and 2.7 liters (11 cups) for the average adult female.