I'ld rather have my guests mooching around in the refrigerator on their own than wanting me to wait on them all the time.

Then again, they are not your house-guests. They have their own kitchen nearby, so it's odd that they would come over wanting to appease their appetites.

If they have been good to you and this visit is not a matter of months on end, then I would be tolerant of what they are doing. I would even make a point of trying to have things on hand that would appeal to them. Eating out can get old. It's nice to spend time at home having drinks and snacks together in a family atmosphere.

On the other hand, if you find their behavior intrusive, just don't have anything they like around. Then they'll go elsewhere . . . to the store, or home, or to a restaurant.

Basically, it wouldn't bother me. but that's just me.