HAL 376 Lecture Notes - Lecture 7: Biological Value, Lean Body Mass, Nitrogen Balance
22 Mar 2017
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Biological value (bv: bv of a protein = measure of how efficiently the absorbed food protein is converted into body tissue protein. If food possesses adequate amounts of all 9 essential aas, it should allow a person to efficiently incorporate aas from food protein into body protein. Bv = nitrogen retained (g)/nitrogen absorbed (g) x 100. Chemical score = mg of limiting aa per g of protein/ (cid:373)g of li(cid:373)iti(cid:374)g aa per g of (cid:862)ideal(cid:863) protei(cid:374) Recommended intakes of protein: rdas for adults: 56g/day for 154lb (70kg) man and 46g/day for a 125lb (57kg) woman, convert weight from pounds to kg: 125 pounds/2. 2 pounds/kg = 57kg (woman: calculate rda: 70kg x 0. 8g protein/kg body weight = 56g (man) 57kg x 0. 8g protein/kg body weight = 46kg (woman: excess protein cannot be stored as such carbon skeletons are metabolized for energy needs/used for other purposes.
