You'd need macro capability, so you'd either need a macro lens, or add on a close-up filter or extension tube with a regular zoom lens with some close-up capability. Most lenses can achieve the close-up reproduction for normal food photography quite easily, so you needn't worry too much about that. Ensure that you have sufficient working distance to avoid casting shadow over your subject (food), and decide how much background you want for your food shots. Some people prefer more background details, so a 50mm macro lens will be ideal. Others prefer more isolated shots, so 100mm macro lens will be good for that.
Either way, pay more attention to your lighting than your choice of lens. That'll make or break a food shot more than anything else.