Nov 5 - Fitch Ratings has upgraded the secured bank credit facility and senior unsecured debt ratings of Dean Foods Company (Dean; NYSE: DF) and the senior unsecured debt rating of Dean Holding Company as follows: Dean Foods Company (Parent) --Issuer Default Rating (IDR) to 'B+' from 'B'; --Secured bank credit facility to 'BB+/RR1' from 'BB/RR1'; --Senior unsecured debt to 'BB-/RR3' from 'B-/RR5'. Dean Holding Company (Operating Subsidiary) --IDR to 'B+' from 'B'; --Senior unsecured