protein
some functions of proteins are to dissolve other nutrients,to provide energy,and to store energy.
the reasons this is the most essential nutrient is ..
found in every cell and tissue.
the mineral of the bone is held together by protein
our blood vessals,organs ans skin is all held together by structural protein
proetins are antibodies that help fight against infection
you couldnt live "healthy" without it
http://bonfirehealth.com/importance-protein-sources/
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