Which of the following statement is TRUE about NPU (net protein utilization), used in protein quality assessment?
Net Protein Utilization (NPU) is the ratio between nitrogen retained by the body and total nitrogen intake multiplied by 100. It is a product of digestibility coefficient and biological value divided by 100. It gives a more complete expression of protein quality than the amino acid score. In calculating protein quality, 1 gram of protein is assumed to be equivalent to 6.25 g of N. Ref: Park's Textbook of Preventive and Social medicine, 19th Edition, Page 503.
It is the ratio of energy from protein to total energy in diet
It is the ratio between nitrogen retained by the body and total nitrogen intake multiplied by 100
It is the amount of one amino acid per gram of a protein divided by the amount of same amino acid per gram of egg protein
If the NPU is high the amount of protein requirement in diet is high