In their book Hungry Planet, photographer Peter Menzel and Faith D'Aluisio visited 24 countries, from the wealthiest to the neediest of nations, and photographed what families there eat during the course of a typical week.
This one above is a week's worth of food to a family living in the Central Andean Highlands.
http://www.menzelphoto.com/hungryplanet/ - via Yahoo! Picks
I think it is by the same people. It is called Material World. Instead of photographing the families with food, the families haul everything they own out of their house and arrange it on the front yard and pose with it - home, possessions, family. They run the gambit from conspicuous consumers in front of their McMansion to impoverished rural folk with little more than a straw mat and a bowl. Powerful stuff!