Social & Preventive Medicine

Which of the following statement is TRUE about NPU (net protein utilization), used in protein quality assessment?

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