CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the long-term Issuer Default Rating (IDR) at 'BBB' for Flowers Foods Inc. (Flowers) upon its recent announcement that it will acquire Dave's Killer Bread (DKB) primarily with debt for $275 million. The Rating Outlook is Stable. A full list of ratings follows at the end of this release. KEY RATING DRIVERS DKB Acquisition Opens New Category: The purchase of DKB, a private-held company specializing in the manufacture of organic bread, would expa