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Randy Metcalf/The Explorer, Zak Pfau helps pack and organize food at Marana’s food bank on a recent morning. Last month, the group served 2,400 people in 699 households, more than double the amount of people it served in May 2007. Regionwide, food banks have seen a spike in demand for their services, with more and more requests for assistance coming from middle-class families, food bank officials say.