Kellogg to buy millennial startup RXBar for $600 million

Kellogg Co. is buying the upstart company behind protein bar maker RXBar for $600 million, just days after the cereal company hired a former vitamin executive as CEO.Publicly traded Kellogg (K), best known for Frosted Flakes and Pop-Tarts, hasstruggled to make its cereals and snacks more appealing to Americans who want to avoid sugary processed foods. Its revenue has suffered, falling every year since 2013.RXBar says its bars are made with egg whites, fruits and nuts, and exclude dairy, soy or g