Food (n.) for the worker is fuel that keeps the flame of living labour from going out.
Food (n.) is the original source of rent, since somebody can always be found who will do something to obtain it.
Food (n.) is what slave, serf and wage labourer all receive — exactly enough to go on existing as slave, as serf, as wage labourer.
Food (n.) is given the worker as it is to any mere means of production — the way boilers get coal and machinery gets grease and oil.
Food (n.) bought by workers is, in the capitalist's eyes, only the upkeep of his extra labour-power — though, unlike the slave-owner, he lets the workers do their own shopping.