Unilever Bestfoods said Wednesday it would strip trans fats from its I Can 't Believe It 's Not Butter spreads by the middle of next year .
Unilever Bestfoods said its " I Can 't Believe It 's Not Butter ' margarine spreads will be free of trans fat by next year .
But tropical storm warnings and watches were posted today for Haiti , western portions of the Dominican Republic , the southeastern Bahamas and the Turk and Caicos islands .