The increase in food stamp use among this demographic is hard to measure, as they represent a cross section of characteristics not specifically tracked by the Agriculture Department, which administers the program.

But general unemployment figures among the group are stark: Between the ends of 2007 and 2009, unemployment among those aged 20 to 34 rose 100 percent, and between 2006 and 2009, unemployment among those with a bachelor’s degree or higher was up 179 percent.

And in cities that are magnets for 20- and 30-something creatives and young professionals, the kinds of food markets that specialize in delectables like artisanal bread, heirloom tomatoes and grass-fed beef have seen significant upticks in food stamp payments among their typical shoppers. At the Wedge, a market in the stylish Uptown neighborhood of Minneapolis; at New Seasons Market, a series of nine specialty stores in and around Portland, Ore.; and at Rainbow Grocery, a stalwart for food lovers in San Francisco’s Mission District, food stamp purchases have doubled in the past year.