Feces nitrogen losses

Net protein utilization Nutritional procedure or test used to determine protein quality. It is defined as the amount of the ingested nitrogen that is retained by the body. In other words, it is calculated after subtracting nitrogen losses in feces and urine from nitrogen intake. The net protein utilization value is highly correlated with the protein efficiency ratio and the essential amino acid balance. 

Ans. Nitrogen balance is achieved when the intake of protein nitrogen is equal to the loss of nitrogen in the urine and feces. 

The impact of physical activity on protein needs has been determined principally by using the nitrogen balance method. This approach requires measurements of nitrogen intake and losses (urine and feces) to determine individual protein requirements in response to stressors such as physical activity. A positive balance suggests protein accretion, whereas a negative balance suggests a net loss of body protein. 

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