CHICAGO--(BUSINESS WIRE)--Fitch Ratings has downgraded Mastellone Hermanos Sociedad Anonima's (Mastellone) local currency Issuer Default Rating (IDR) to 'CCC' from 'B-' and its senior unsecured notes to 'CCC-/RR4' from 'CCC/RR4'. All the ratings have been placed on Rating Watch Negative. A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS The downgrade of Mastellone's local currency IDR and its senior unsecured notes' reflects increased leverage and tighte