Calculation of Daily Water Loss in Humans
Author: kawanodeExecutions: 3911
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Calculates the average amount of water lost per day.
From a Waseda University press release.
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It is important to note that even if a man in his 20s loses an average of 4.2 liters of fluid per day, this does not mean he needs to drink 4.2 liters of water daily.Approximately 10% (about 0.4 L) of this fluid is produced within the body during energy metabolism, and a small amount of water also enters the body through exhalation and other means. Therefore, about 85% of this total (approximately 3.6 L) serves as the recommended daily fluid intake guideline.Furthermore, since many foods contain water, simply eating “nutritious meals” provides a significant amount of fluid. For Japanese people, if they eat three typical meals a day, they will obtain about half of the 3.6 liters of fluid from their diet, meaning the amount needed as “liquid fluid intake” is approximately 1.8 liters per day.For women in their 20s, the daily requirement is approximately 1.4 liters.
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It is important to note that even if a man in his 20s loses an average of 4.2 liters of fluid per day, this does not mean he needs to drink 4.2 liters of water daily.Approximately 10% (about 0.4 L) of this fluid is produced within the body during energy metabolism, and a small amount of water also enters the body through exhalation and other means. Therefore, about 85% of this total (approximately 3.6 L) serves as the recommended daily fluid intake guideline.Furthermore, since many foods contain water, simply eating “nutritious meals” provides a significant amount of fluid. For Japanese people, if they eat three typical meals a day, they will obtain about half of the 3.6 liters of fluid from their diet, meaning the amount needed as “liquid fluid intake” is approximately 1.8 liters per day.For women in their 20s, the daily requirement is approximately 1.4 liters.
| Water Metabolic Cycle | ml/Japanese |
Water is constantly required for human life support, body temperature regulation, blood circulation, and physical activity. While the amount of water contained in the human body (stock) has long been known, it may come as a surprise that it has been difficult to accurately determine how much water enters and leaves the body (flow).Recently, the National Institute of Biomedical Innovation, Health and Nutrition (NIBIOHN; Ibaraki City, Osaka Prefecture; President: Yusuke Nakamura)Yosuke Yamada, Director of the Department of Physical Activity Research, and Tsukasa Yoshida, a researcher at NIBIOHN, in collaboration with Professor Motohiko Miyaji and Assistant Professor Daiki Watanabe of Waseda University; Misaka Kimura, a visiting researcher at Kyoto University of Advanced Science; Assistant Professor Hiroyuki Shimoyama of the University of Tsukuba; and researchers from institutions in the United States, the United Kingdom, China, the Netherlands, and other countries,conducted a study using stable isotopes on a total of 5,604 men and women—ranging from 8-day-old infants to 96-year-old seniors—residing in 23 countries, and developed the world’s first formula to predict daily water balance (hereinafter referred to as “water metabolism”) in the human body.The findings of this study were published in the journal *Science* on November 25, 2022.
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