ABSTRACT
The primar y purpos e o f carbohydrate and fat metabolism i s to provid e th e organ -
i sm wi t h energy . Th e thir d majo r component o f th e h u m a n diet , th e protein , i s
required primaril y fo r th e purpos e o f replacin g tissu e protei n broke n d o w n a s
part o f norma l tissu e metabolis m an d t o provid e th e organis m wi t h certai n
required nitrogenou s substances . Th e replacement o f tissu e protei n require s tw o
r a w material s tha t ar e usuall y provide d b y dietar y protein : th e essential amino
acids, w h i c h ar e amino acid s tha t canno t b e synthesize d i n th e h u m a n organism ,
and nitrogen , w h i c h i s provide d b y bot h th e essentia l an d nonessentia l dietar y
amino acids . Th e nitrogen requiremen t can be supplie d b y a n inorganic nitroge n
source, suc h a s ammoniu m salt .
