Calculation of N and P from dietary protein intake

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Calculation of N and P from dietary protein intake

Dear colleagues,

A brief question: in order to get an idea of the N and P content in urine, there is this rule of thumb to derive the concentration from the protein intake of people:

N = 0.13 x total food protein
P = 0.011 x (total food protein + vegetal food protein)

Does anyone know the original source of publication for this equation?

Many thanks in advance..!

Mariska.
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