NUTR 3210 Lecture Notes - Lecture 11: High-Protein Diet, Nutrient, Nitrogen Balance
22 Feb 2017
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Document Summary
Provides amino acids (aas) for protein and other areas of metabolism. 21 proteinogenic aas (i. e. used to make protein: includes selenocysteine, 22 aas in reality (however, pyrolysis is used by bacteria, not humans) 9 aas considered essential or indispensible for humans: histidine was the last aa to be added to the essential list. Health canada recommends a daily protein intake between 10-30: average consumption in north america ~16% of daily calories, we don"t need protein per se, but rather the aas in protein. Two types of amino acids in the body: standard amino acids, 21 proteinogenic aas, 20 classi ed as standard . Except selenocysteine: non-standard amino acids, usually formed by post-translational modi cation of other aas or as intermediates in the metabolic pathways of standard aas. For example, the gaba neurotransmitter is a metabolite of the amino acid glutamate: many exist, but they are rarely used to make proteins, we don"t talk about these much.
