A major change in the national diet is under way: Heart-damaging trans fat is rapidly disappearing from grocery aisles and restaurant food, too. But are its replacements really healthier?

• 一个全国的饮食变化正在进行：损害心脏的反义脂肪正迅速的从食品超市和餐馆中消失。但是，替代它真的对健康有益么？