Excretion, Apparent Absorption Rate, and Balance

It is a phenomenon that 98-99% of sodium intake in humans is absorbed by, and excreted through, urine and milk (Tables 1.2-8 and 1.2-9). 

Fecal excretion of sodium is limited to 1 -2%, which is extremely low in comparison to other elements. The apparent absorption rate of sodium is 98%, and this compares 

The sodium content of the 24-hour urine collected over 7 days was a very good indica- 

Sodium excretion and balance have also been estimated in nursing (29-35 days of lactation) and non-nursing young women. Breast-feeding women excrete 4% of the sodium intake through the milk, and their sodium balance was —3.6% (i.e., practically equalized). Breast-feeding women secreted -120 mg Na each day into the milk (Table 1.2-9) (Anke et al. 2000b). 

Levels of sodium in human milk vary between 150 and 170 mg (Birkbeck and Vause 1977), though a high or low maternal sodium intake does not affect the sodium content of the milk (Ereman et al. 1987, Dawes 1970). 

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Tab. 1.2-8 Sodium intake, excretion, apparent absorption rate and balance of sodium in people with mixed and ovo-lacto-vegetarian diets...

Metabolism, Excretion, Apparent Absorption Rate, and Balance... 

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