If someone is invited to your house, can you feed them? Really?
Offer them coffee or tea with sugar, lemon, honey, milk? Can you offer them fruit or fix a quick snack? Can you pull together a quick and small meal?
This has nothing to do with the economy or economizing, nor having steak or expensive foods to feed others than yourself or family. It's mostly an observation that people just don't have a variety of foods in their refrigerator more than two days per week.
I never come empty handed (even for a quick hello visit), but I find myself bringing coffee, muffins or croissants just in case I might get hungry.