noun
ADJECTIVE
▪ essential
▪ natural
▪ animal , vegetable
VERB + PROTEIN
▪ contain , supply
▪
Cereals supply essential ~ and vitamins.
▪ be high in , be rich in
▪ produce
PROTEIN + VERB
▪ be found in sth
▪
Gluten is a ~ found in wheat and other grains.
PROTEIN + NOUN
▪ content
▪ level
▪ intake
▪ deficiency
PHRASES
▪ a source of ~