As nouns the difference between foodstuff and feedstuff
is that foodstuff is an instance of material which may be used as food while feedstuff is feed for animals; fodder.
foodstuff
English
Noun
(
en noun)
An instance of material which may be used as food.
feedstuff
English
Noun
(uncountable) feed for animals; fodder
(countable) Any particular form of such feed