Page 256 - Biochemistry2 (08PB403)

Nitrogen balance

It means that individual daily intake of nitrogen, primarily in
the form of dietary protein (100 g protein contain16 g
nitrogen), equals the amount of nitrogen lost by excretion in the
feces and urine

Nitrogen balance: Nitrogen intake =

Dietary N2 nitrogen loss} Excretion in
protein intake  Urine (NPN)
N2
loss o Urea, uric acids
N2 o Creatinine,
balance
Creatine
o AAs, Ammonia
 Faeces
 Milk, menstrual fluid