“The recommendation to drink 8 glasses of water per day is not medically necessary for most people.”

Although nutritional and physiological research teams and professional organizations have described the daily total water intakes (TWI, L/24h) and Adequate Intakes (AI) of children, women, and men, there is no widespread consensus regarding the human water requirements of different demographic groups. The 2004 U.S. National Academy of Medicine (NAM) publication concluded that: (a) individual water requirements can vary greatly on a day-to-day basis because of differences in physical activity, climates, and dietary contents; and (b) there is no single daily water requirement for a given person.

Adults who stay well-hydrated appear to be healthier, develop fewer chronic conditions, such as heart and lung disease, and live longer than those who may not get sufficient fluids, according to a National Institutes of Health study published in eBioMedicine. The results suggest that proper hydration may slow down aging and prolong a disease-free life, as decreased body water content is the most common factor that increases serum sodium.

Daily water intake recommendations vary by age, sex, pregnancy status, activity level, and breastfeeding status. Daily water intake is mostly from water and other beverages. Foods, especially those with high water content such as many fruits and vegetables, can also add to fluid intake.

In order to ensure optimal hydration, it is proposed that optimal total water intake should approach 2.5 to 3.5 L day−1 to allow for the daily excretion of 2 to 3 L of dilute (< 500 mOsm kg−1) urine. ... European and American urological associations encourage maintaining a fluid intake sufficient to produce 2 to 2.5 L of urine per day to reduce risk of stone formation.

No scientific studies were found in support of 8 x 8. Rather, surveys of food and fluid intake on thousands of adults of both genders, analyses of which have been published in peer-reviewed journals, strongly suggest that such large amounts are not needed because the surveyed persons were presumably healthy and certainly not overtly ill.

Much like the recommendation that healthy adults should consume 2,000 calories per day, a recommendation that adults consume 64 ounces of water a day is also a generalization. “It's a one-size-fits-all that doesn't fit all,” says Hew-Butler, adding that everyone's fluid needs will fluctuate depending on their individual circumstances.

Most people need about four to six cups of plain water each day. But it may be surprising to learn that water intake is an individualized number. While the daily four-to-six cup rule is for generally healthy people, that amount differs based on how much water they take in from other beverages and food sources.

The Academy of Nutrition and Dietetics recommends sipping down the following for daily fluid intake: 100 ounces/12.5 cups (3.1 liters) for men. 73 ounces/9 cups (2.1 liters) for women. But consider those numbers a starting point. Your size, metabolism, location, diet, physical activity and health all factor into how much water you need to drink per day, says family medicine specialist Saadia Hussain, MD. (In reality, that number is somewhat arbitrary and not rooted in scientific evidence.)

“Staying hydrated is always a good idea, but the blanket recommendation to drink eight glasses of water every day is not supported by strong data or rigorous academic studies,” says Dr. Saldarini. “For most people, drinking this much water only increases the amount of urine they excrete.”

The National Academies of Sciences, Engineering, and Medicine note that women should consume about 2.7 liters of water per day, while men should consume about 3.7 liters per day. That's about 11.5 cups a day for women and 15.5 cups a day for men. This includes water from both foods and drinks. However, fluid needs can vary by individual, Wohlford says.

Overhydration due to drinking too much water causes water toxicity, an electrolyte imbalance that can cause symptoms ranging from nausea and headache to unconsciousness and coma. To avoid overhydrating, try to drink no more than about 9–13 cups of fluids per day.

The 64 ounces your doctor recommends is based on the guideline of eight glasses of water per day. Another common rule of thumb is to drink half your body weight in ounces of water each day. With our own patients, we simplify things and recommend drinking to quench thirst and -- this is the important part -- enough to ensure that the urine runs clear.

The short answer is "no." The more complicated answer, according to Registered Dietitian Caroline Fox, is that the actual recommended amount differs for everyone. "More recent guidelines on fluid intake can be found from the Institute of Medicine and Dietary Reference Intakes.," says Fox, who works at the Tufts Medical Center Weight and Wellness Center. "They recommend 2.7 liters (11 cups) a day for women; 3.7 liters for men."

While drinking 8 glasses (64 ounces / 2 liters) is an easy goal to remember and can certainly be reasonable for some, many factors affect individual hydration needs, including weather, sweat rate, sweat type, pregnancy or breastfeeding, and overall health. It is best to drink water and other fluids at regular intervals throughout the day rather than relying on thirst alone.

Untuk mendapatkan manfaat minum air putih, orang dewasa umumnya disarankan untuk mengonsumsi air putih sebanyak 8 gelas atau setara dengan 2 liter setiap hari. Sementara itu, wanita hamil disarankan untuk mengonsumsi air putih sebanyak 2,5 liter per hari dan wanita menyusui 3 liter per hari. Anda pun dianjurkan untuk mengonsumsi air putih lebih banyak saat kondisi tertentu, seperti setelah berolahraga, saat cuaca panas, atau ketika mengalami demam, diare, dan muntah-muntah.

People often hear that they should drink eight glasses of water per day. However, the amount of water a person should drink can vary depending on their age, activity level, and more. The commonly touted wisdom of eight glasses of water per day may be suitable for some people, but it is not a “one-size-fits-all” recommendation. Some experts say there is a lack of scientific evidence supporting these claims.

Not everyone requires the same amount of fluid to stay hydrated. How much water you need depends on a variety of factors, including your age, health status, activity level and even where you live. According to the National Academies of Science, Engineering and Medicine, sufficient daily fluid intake for people in a mild climate region is: 3.7 liters (15.5 cups) for men. 2.7 liters (11.5 cups) for women.

Your fluid needs are about 1 milliliter (ml) for every calorie required in your diet. It is important to drink fluids even if you are not thirsty. Thirst is not a good signal of fluid needs.

It is a common belief that you have to drink 6-8 glasses of water per day. The actual notion of 8 glasses a day originates from a 1945 US Food and Nutrition Board which recommended 2.5 litres of daily water intake, but this was not based on any research and stated that most of the water intake could come from food sources.

Dartmouth Professor Finds No Scientific Evidence for '8 x 8'. Hanover, NH -- It has become accepted wisdom: "Drink at least eight glasses of water a day!" Not necessarily, says DMS physician Heinz Valtin, MD. The universal advice that has made guzzling water a national pastime is more urban myth than medical dogma and appears to lack scientific proof, he found.

Anda mungkin sering mendengar anjuran untuk minum air putih delapan gelas per hari. Nyatanya, anjuran ini belum tentu berlaku untuk semua orang. Bisa jadi Anda butuh minum air putih kurang atau melebihi rekomendasi ini. Pada umumnya, kebanyakan orang memang tercukupi kebutuhannya dengan minum 8 gelas per hari atau setara dengan dua liter. Meski demikian, berapa liter kebutuhan minum air putih dalam sehari bisa berbeda pada setiap orang.