Which means they either need to be worked, i.e. labor is needed; or there is scarcity of food and goods. Neither option results in a post-scarcity society.
You clearly have not realized the sheer amount of food that stores throw away because it wasn’t purchased. Not because it wasn’t edible, but because it didn’t turn X profit in Y time. Dumpsters are secured and food often deliberately made inedible. Very little is ever simply donated because that would call capitalism into serious question.