Daily Body Water Losses

How Much Water Do We Lose Daily?

Our body loses water constantly and through more than one route (Figure 7.2 and 7.3). In fact, no other essential nutrient is lost from the body by as many routes and at the same levels as water. Water is lost as urine and through breath as well as from skin surfaces as sweat. For an average

Figure 7.2 Our sweat glands begin deep in our skin and they ooze sweat when they are stimulated by our brain when our body temperature rises and by circulating epinephrine during exercise.

adult it is typical to lose as much as 2 to 3 liters (quarts) daily. As one milliliter of water is the same as one gram of water, this equals 2 to 3 kilograms or 0.9 to 1.4 pounds. This means we need to replace water at the same level as what is lost in order to prevent dehydration. This requirement is higher than all other essential nutrient requirements combined.

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