The nation's largest store retailer, which has a big regional warehouse near Bethlehem, has struggled to keep its massive grocery business competitive. The Kellogg's veteran says Walmart has pressured Kellogg's and other suppliers to "change our model" and cut the regional centers in order to simplify distribution, in hopes of reducing its own costs. MAY 31: Kellogg Co., the Michigan-based maker of Froot Loops, Corn Flakes, Nutri-Grain, Pringles, Keebler, MorningStar Farms, and other mass-market breakfast, cereal, and snack brands, plans to close two Pennsylvania regional offices and distribution centers in August and put more than 500 workers on the street, as part of a national switch from shipping boxed products straight to stores to instead piling them up at retailers' warehouses.