The state’s largest food bank is struggling to meet heightened demand. Casey Miller, deputy director of the Food Bank of Iowa, says donations from the nation’s food companies are down significantly, about 30 percent.Miller’s organization provides food to 265 different food banks and soup kitchens in 42 counties, and she says it’s getting tougher to meet demand.Miller says more Iowans are getting laid off, and lower income Iowans may find it more difficult to pay their winter utility bills, which will increase demand for Food Bank services even more. The Food Bank of Iowa begins its annual holiday food drive later this month.