how many cups of water do we need a 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 general rule of thumb is that you should drink eight 8 ounce glasses of water per day (at least). Interestingly some agencies claim that total fluid intake (water and other fluids) should exceed 3 liters for men and 2.2 liters for women.
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Instead of the 64 oz (8-8 oz glasses) rule, opt for drinking one-half to two-thirds of your body weight in ounces of water each day. For example, someone who weighs 150 pounds should drink at least 75 oz each day. According to the Mayo Clinic, the average adult loses in excess of 10 cups of water per day.
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The NHS advise drinking six to eight glasses of fluids per day. However, drinking way more than that can impact negatively on your health too. To put it into another perspective, this is about three or four 500ml bottles of water.
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So how much fluid does the average, healthy adult living in a temperate climate need? 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 Institute of Medicine recommends consuming between 91 and 125 fluid ounces of water per day as an adult[*]. This amount will vary depending on the individual and lifestyle factors such as age, diet, weight, and activity level.
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—, it would be somewhere between 1 and 3 liters— that's the equivalent of losing between four and 13 8-ounce glasses of water every day. To stay well hydrated, the U.S. government estimates that women need 2.7 liters (11 glasses) of water and men need 3.7 liters (16 glasses) each day.
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The National Academy of Sciences recommends drinking about 11 cups of water per day for women and 16 cups per day for men. But, this number can vary based on lifestyle, body size, and other factors. If you're active, you'll need to increase your daily water intake.
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The Institute of Medicine says children and teenagers should consume about two to three quarts of water a day (1.7 to 3.3 liters, the IOM says), depending on age, size and sex. Adolescent boys generally need to drink more water than girls do, research suggests.
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What about the advice to drink 8 glasses a day? You've probably heard the advice, "Drink eight 8-ounce glasses of water a day." That's easy to remember, and it's a reasonable goal. Most healthy people can stay hydrated by drinking water and other fluids whenever they feel thirsty.
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As a rough guideline, the Dieticians of Canada suggest 2.2 litres (nine cups) per day for women and three litres (12 cups) for men. These totals include food moisture, which accounts for about one-fifth of the average person's liquid intake-and more for people who eat a lot of fruit and veggies.
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You typically get about 20% of the water you need from the food you eat. Taking that into account, women need about nine cups of fluid per day and men about 12.5 cups in order to help replenish the amount of water that is lost.
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Replenish your fluids. The amount of water that is right for your body depends on several factors. The U.S. National Research Council recommends eight to ten eight-ounce glasses a day. Another way to calculate the right amount is to divide your body weight in half (using pounds), then drink that many ounces.
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The average human should be drinking at least 8 cups, or 64 oz, of water a day. This means that if you fill up your reusable bottle once, you are already drinking half of your daily goal. This amount of water alone would require you to use two 16-oz plastic bottles; you'd need four for the entire day.
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The average person will need 5 liters of water to drink daily, to survive in a moderate climate with little activity. An average American uses 100 to 175 gallons of water per day.
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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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However, there are recommendations for total water intake, which includes water consumed through all foods and beverages, such as plain water, fruits, and vegetables. A total daily intake of around 2.7 liters (91 ounces) for women and 3.7 liters (125 ounces) for men can meet most adults' needs (19).