Food, it's the stuff we eat. Tacos, cookies, salads, red meat, disgusting vending machine sandwiches... all of it. Maybe even us, if we're not careful.
Grub, ingestant, energy, feed... it is called many names. It generally smells better coming than it does leaving except in those universes where time works in the other direction. It protects the mortals from starvation, is so fundamental to life that most religions have much to say on the subject, even the gods eat (though good luck getting ahold of that stuff).
Beware of any books that the preliminary translations suggest might be titled "To Serve Mankind".