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The '''net protein utilization''', or NPU, is the ratio of [[amino acid]] converted to [[protein]]s to the ratio of amino acids supplied. This figure is somewhat affected by the salvage of [[essential amino acid]]s within the body, but is profoundly affected by the level of [[essential amino acid|limiting amino acids]] within a foodstuff.
Experimentally, this value can be determined by determining [[diet (nutrition)|diet]]ary protein intake and then measuring [[nitrogen]] [[excretion]]. One formula for NPU is:
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