CHICAGO & SAO PAULO--(BUSINESS WIRE)--Fitch Ratings has affirmed and withdrawn the ratings for Natura Cosmeticos S.A. (Natura). The Rating Outlook has been revised to Negative from Stable. The Outlook revision to Negative reflects Fitch's concerns regarding the challenges Natura faces as it seeks to reformulate its business strategy in light of evolving tough market dynamics. During the past few years, the company's EBITDA margin has declined to about 20% from 24% and its market share has decli