Mmmm, hard choice - does different flavours of ice cream count as "one food"? If it did I'd go for ice creams sold by the Movenpick chain store.
However, realistically, one would soon be tired of whatever the unlimited supply is. Something similar has happened to me, with chocolate, since I've started living at and helping in the corner store. I've put on a bit more weight since then, and now I'm even almost tired of chocolate. Hard as that may be to conceive of.
When that happens, I suppose the only thing to do is to voluntarily deny yourself the thing to which you have unlimited access of, until enough time passes and you'd like some of it again.