Obligatory nitrogen loss

Be familiar with the reasons why amino acids are required in the diet the significance of essential amino acids, the concept of nitrogen balance, the meaning of obligatory nitrogen loss, and the nature of protein deficiency diseases. 

The answer is c. (Murray, pp 123-148. Scriver pp 2367-2424. Sack, pp 159-175. Wilson, pp 287-317.) The daily intake of 62.5 g of high-quality protein is above the minimum daily requirement for a 70-kg adult (45 g protein per day). As the obligatory nitrogen losses are covered by the dietary intake, this man will be in nitrogen balance (i.e., 0) and nitrogen loss will equal nitrogen intake. 

Scrimshaw, N, k, Perem, W, D and Young, V. R. (1976), Protein requirements of man Obligatory urinary and fecal nitrogen losses In elderly woman. /. Nulr. 106, 665-670. 

Obligatory urinary nitrogen losses of young adults amount to about 37 mg/kg of body weight. 

The BV of protein is determined by measuring the amount of N consumed and that excreted. First, the obligatory losses of urinary and fecal N must be determined, which requires the feeding of nitrogen-free diets. This is followed by a determination of the amoimts of urinary and fecal N with consumption of the test protein. The differences in N excreted between the two dietary conditions is expressed as [A fecal N] and [A urinary N]. The Greek capital delta conventionally means "the change in." The formula for the BV is... 

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