According to this research, since the daily flow of water in and out of the human body (hereinafter referred to as "water turnover") is extremely rapid, survival can be endangered if water is not replenished for just three days.However, the turnover of water varies greatly depending on individual differences and living environments, and until now it has been difficult to understand the whole picture.

　Therefore, a total of 23 men and women, ranging from infants aged 8 days to 96 years old, living in 5604 countries, applied a survey method using mass spectrometry of stable isotopes of hydrogen, and examined water turnover. Calculated.

　As a result, it was found that, on average, about 25% of body water is lost in infants and about 10% of body water in adults per day.Regarding individual differences, water turnover is rapid in hot and humid environments and at high altitudes, and it is recognized that high-level physical activity, athletes, pregnant women, and people with large muscle mass also have high water turnover. rice field.

　Considering the degree of influence of these factors, researchers constructed a formula that can predict the amount of water that a person will lose in a day by applying weight, age, average temperature and humidity of the day, etc. succeeded in doing

　It is expected that this result will clarify the standard amount of water intake necessary to prevent dehydration and heatstroke in various environments, as well as prevent kidney and heart disorders associated with dehydration.In addition, it is believed that the prediction formula that was discovered will be useful in formulating strategies for securing drinking water and food during disasters and emergencies, as well as in constructing prediction models for water shortages around the world.

Paper information:[Science] Variation in human water turnover associated with environmental and lifestyle factors